<?xml version='1.0' encoding='US-ASCII'?><schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:ast="http://ast/20260331" xmlns:dei="http://xbrl.sec.gov/dei/2025" xmlns:srt-types="http://fasb.org/srt-types/2025" xmlns:deprecated="http://www.xbrl.org/2009/role/deprecated" xmlns:dtr="http://www.xbrl.org/2009/dtr" xmlns:oef="http://xbrl.sec.gov/oef/2025" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:us-gaap="http://fasb.org/us-gaap/2025" xmlns:oef-pre="http://xbrl.sec.gov/oef-pre/2025" xmlns:oef-lab="http://xbrl.sec.gov/oef-lab/2025" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:country="http://xbrl.sec.gov/country/2025" xmlns:us-roles="http://fasb.org/us-roles/2025" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:us-types="http://fasb.org/us-types/2025" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" xmlns:oef-def="http://xbrl.sec.gov/oef-def/2025" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:srt="http://fasb.org/srt/2025" xmlns:oef-sr="http://xbrl.sec.gov/oef-sr/2025" xmlns:srt-roles="http://fasb.org/srt-roles/2025" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrli="http://www.xbrl.org/2003/instance" targetNamespace="http://ast/20260331" elementFormDefault="qualified"><import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/><import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/><import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/><import namespace="http://fasb.org/us-types/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd"/><import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/><import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/><import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/><import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd"/><import namespace="http://xbrl.sec.gov/oef-sr/2025" schemaLocation="https://xbrl.sec.gov/oef/2025/oef-sr-2025.xsd"/><import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/><import namespace="http://fasb.org/us-roles/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd"/><import namespace="http://fasb.org/srt-roles/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd"/><annotation><appinfo><link:linkbase id="lnk"><link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReport" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReport"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportHoldingsDetails"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportLineGraphDetails"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportAverageAnnualReturnDetails"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#BroadBasedIndexOnly"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#AdditionalIndexOnly"/><link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#IndustrySectorOnly"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/LargestHoldingOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#LargestHoldingOnly"/><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReport"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#ast_C000241324Member" xlink:label="C000241324Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241324Member" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_C000241325Member" xlink:label="C000241325Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241325Member" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/></link:presentationLink><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#ast_C000241324Member" xlink:label="C000241324Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241324Member" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_C000241325Member" xlink:label="C000241325Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241325Member" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/><link:loc xlink:type="locator" xlink:href="#ast_SectorOtherAssetsandLiabilitiesSectorMember" xlink:label="SectorOtherAssetsandLiabilitiesSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="SectorOtherAssetsandLiabilitiesSectorMember" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_UtilitiesSectorMember" xlink:label="UtilitiesSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="UtilitiesSectorMember" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrialSectorMember" xlink:label="IndustrialSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="IndustrialSectorMember" order="103.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnergySectorMember" xlink:label="EnergySectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="EnergySectorMember" order="104.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TechnologySectorMember" xlink:label="TechnologySectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="TechnologySectorMember" order="105.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BasicMaterialsSectorMember" xlink:label="BasicMaterialsSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="BasicMaterialsSectorMember" order="106.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_FinancialSectorMember" xlink:label="FinancialSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="FinancialSectorMember" order="107.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CommunicationsSectorMember" xlink:label="CommunicationsSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="CommunicationsSectorMember" order="108.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConsumerCyclicalSectorMember" xlink:label="ConsumerCyclicalSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="ConsumerCyclicalSectorMember" order="109.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConsumerNonMinuscyclicalSectorMember" xlink:label="ConsumerNonMinuscyclicalSectorMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="ConsumerNonMinuscyclicalSectorMember" order="1010.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_LargestHoldingsDomain" xlink:label="LargestHoldingsDomain"/><link:loc xlink:type="locator" xlink:href="#ast_AkuminInc08312031975CTIMember" xlink:label="AkuminInc08312031975CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="AkuminInc08312031975CTIMember" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" xlink:label="CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" xlink:label="PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" order="103.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GrubHubHoldingsInc073120301300700PIKCTIMember" xlink:label="GrubHubHoldingsInc073120301300700PIKCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="GrubHubHoldingsInc073120301300700PIKCTIMember" order="104.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_EnvisionHealthcareCorpCTIMember" xlink:label="EnvisionHealthcareCorpCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="EnvisionHealthcareCorpCTIMember" order="105.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_AvayaInc080120281MSOFRPlus750CTIMember" xlink:label="AvayaInc080120281MSOFRPlus750CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="AvayaInc080120281MSOFRPlus750CTIMember" order="106.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" xlink:label="GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" order="107.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" xlink:label="GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" order="108.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_RainCarbonInc090120291225CTIMember" xlink:label="RainCarbonInc090120291225CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="RainCarbonInc090120291225CTIMember" order="109.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" xlink:label="IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" order="1010.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="InvestmentTypeCategorizationMember"/><link:loc xlink:type="locator" xlink:href="#ast_CorporateBondsCTIMember" xlink:label="CorporateBondsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="CorporateBondsCTIMember" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BankLoansCTIMember" xlink:label="BankLoansCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="BankLoansCTIMember" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_CommonStocksCTIMember" xlink:label="CommonStocksCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="CommonStocksCTIMember" order="103.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConvertibleBondsCTIMember" xlink:label="ConvertibleBondsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ConvertibleBondsCTIMember" order="104.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_PreferredStocksCTIMember" xlink:label="PreferredStocksCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="PreferredStocksCTIMember" order="105.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_RightsandWarrantsCTIMember" xlink:label="RightsandWarrantsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="RightsandWarrantsCTIMember" order="106.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_AssetTypeOtherAssetsandLiabilitiesCTIMember" xlink:label="AssetTypeOtherAssetsandLiabilitiesCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="AssetTypeOtherAssetsandLiabilitiesCTIMember" order="107.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/></link:presentationLink><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#ast_C000241324Member" xlink:label="C000241324Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241324Member" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_C000241325Member" xlink:label="C000241325Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241325Member" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2211BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2211BroadBasedIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndex2211BroadBasedIndexMember" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2219BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2219BroadBasedIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndex2219BroadBasedIndexMember" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" order="103.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" order="104.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/></link:presentationLink><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#ast_C000241324Member" xlink:label="C000241324Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241324Member" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_C000241325Member" xlink:label="C000241325Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000241325Member" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2211BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2211BroadBasedIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndex2211BroadBasedIndexMember" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2219BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2219BroadBasedIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndex2219BroadBasedIndexMember" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" order="101.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" order="102.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" order="103.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" order="104.0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/></link:presentationLink><link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#ast_C000241324Member" xlink:label="C000241324Member"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000241324Member" order="101.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_C000241325Member" xlink:label="C000241325Member"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000241325Member" order="102.0" priority="1"/></link:definitionLink><link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2211BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2211BroadBasedIndexMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndex2211BroadBasedIndexMember" order="101.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2219BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2219BroadBasedIndexMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndex2219BroadBasedIndexMember" order="102.0" priority="1"/></link:definitionLink><link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" order="101.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" order="102.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" order="103.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" order="104.0" priority="1"/></link:definitionLink><link:definitionLink xlink:type="extended" xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists"><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="InvestmentTypeCategorizationMember"/><link:loc xlink:type="locator" xlink:href="#ast_CorporateBondsCTIMember" xlink:label="CorporateBondsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="CorporateBondsCTIMember" order="101.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BankLoansCTIMember" xlink:label="BankLoansCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="BankLoansCTIMember" order="102.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_CommonStocksCTIMember" xlink:label="CommonStocksCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="CommonStocksCTIMember" order="103.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConvertibleBondsCTIMember" xlink:label="ConvertibleBondsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ConvertibleBondsCTIMember" order="104.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_PreferredStocksCTIMember" xlink:label="PreferredStocksCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="PreferredStocksCTIMember" order="105.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_RightsandWarrantsCTIMember" xlink:label="RightsandWarrantsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="RightsandWarrantsCTIMember" order="106.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_AssetTypeOtherAssetsandLiabilitiesCTIMember" xlink:label="AssetTypeOtherAssetsandLiabilitiesCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="AssetTypeOtherAssetsandLiabilitiesCTIMember" order="107.0" priority="1"/></link:definitionLink><link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/><link:loc xlink:type="locator" xlink:href="#ast_SectorOtherAssetsandLiabilitiesSectorMember" xlink:label="SectorOtherAssetsandLiabilitiesSectorMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="SectorOtherAssetsandLiabilitiesSectorMember" order="101.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BasicMaterialsSectorMember" xlink:label="BasicMaterialsSectorMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="BasicMaterialsSectorMember" order="106.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_FinancialSectorMember" xlink:label="FinancialSectorMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="FinancialSectorMember" order="107.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConsumerCyclicalSectorMember" xlink:label="ConsumerCyclicalSectorMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="ConsumerCyclicalSectorMember" order="109.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConsumerNonMinuscyclicalSectorMember" xlink:label="ConsumerNonMinuscyclicalSectorMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="ConsumerNonMinuscyclicalSectorMember" order="1010.0" priority="1"/></link:definitionLink><link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/LargestHoldingOnly"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_LargestHoldingsDomain" xlink:label="LargestHoldingsDomain"/><link:loc xlink:type="locator" xlink:href="#ast_AkuminInc08312031975CTIMember" xlink:label="AkuminInc08312031975CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="AkuminInc08312031975CTIMember" order="101.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" xlink:label="CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" order="102.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" xlink:label="PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" order="103.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GrubHubHoldingsInc073120301300700PIKCTIMember" xlink:label="GrubHubHoldingsInc073120301300700PIKCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="GrubHubHoldingsInc073120301300700PIKCTIMember" order="104.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_EnvisionHealthcareCorpCTIMember" xlink:label="EnvisionHealthcareCorpCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="EnvisionHealthcareCorpCTIMember" order="105.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_AvayaInc080120281MSOFRPlus750CTIMember" xlink:label="AvayaInc080120281MSOFRPlus750CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="AvayaInc080120281MSOFRPlus750CTIMember" order="106.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" xlink:label="GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" order="107.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" xlink:label="GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" order="108.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_RainCarbonInc090120291225CTIMember" xlink:label="RainCarbonInc090120291225CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="RainCarbonInc090120291225CTIMember" order="109.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" xlink:label="IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" order="1010.0" priority="1"/></link:definitionLink><link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link"><link:loc xlink:type="locator" xlink:href="#ast_C000241324Member" xlink:label="C000241324Member"/><link:label xlink:type="resource" xlink:label="label_C000241324Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000241324</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000241324Member" xlink:to="label_C000241324Member" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_C000241325Member" xlink:label="C000241325Member"/><link:label xlink:type="resource" xlink:label="label_C000241325Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000241325</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000241325Member" xlink:to="label_C000241325Member" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2211BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2211BroadBasedIndexMember"/><link:label xlink:type="resource" xlink:label="label_BloombergUSAggregateBondIndex2211BroadBasedIndexMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Bloomberg U.S. Aggregate Bond Index</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BloombergUSAggregateBondIndex2211BroadBasedIndexMember" xlink:to="label_BloombergUSAggregateBondIndex2211BroadBasedIndexMember" priority="1"/><link:label xlink:type="resource" xlink:label="label_BloombergUSAggregateBondIndex2211BroadBasedIndexMember_2211" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bloomberg U.S. Aggregate Bond Index_2211</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BloombergUSAggregateBondIndex2211BroadBasedIndexMember" xlink:to="label_BloombergUSAggregateBondIndex2211BroadBasedIndexMember_2211" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BloombergUSAggregateBondIndex2219BroadBasedIndexMember" xlink:label="BloombergUSAggregateBondIndex2219BroadBasedIndexMember"/><link:label xlink:type="resource" xlink:label="label_BloombergUSAggregateBondIndex2219BroadBasedIndexMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Bloomberg U.S. Aggregate Bond Index</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BloombergUSAggregateBondIndex2219BroadBasedIndexMember" xlink:to="label_BloombergUSAggregateBondIndex2219BroadBasedIndexMember" priority="1"/><link:label xlink:type="resource" xlink:label="label_BloombergUSAggregateBondIndex2219BroadBasedIndexMember_2219" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bloomberg U.S. Aggregate Bond Index_2219</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BloombergUSAggregateBondIndex2219BroadBasedIndexMember" xlink:to="label_BloombergUSAggregateBondIndex2219BroadBasedIndexMember_2219" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember"/><link:label xlink:type="resource" xlink:label="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">60% ICE BofA US HY Contrained / 40% S&amp;P UBS Leverage Loan</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" xlink:to="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" priority="1"/><link:label xlink:type="resource" xlink:label="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember_2211" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">60% ICE BofA US HY Contrained / 40% S&amp;P UBS Leverage Loan_2211</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" xlink:to="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember_2211" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember"/><link:label xlink:type="resource" xlink:label="label_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">ICE BofA US High Yield Constrained Index</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" xlink:to="label_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" priority="1"/><link:label xlink:type="resource" xlink:label="label_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember_2211" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ICE BofA US High Yield Constrained Index_2211</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" xlink:to="label_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember_2211" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" xlink:label="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember"/><link:label xlink:type="resource" xlink:label="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">60% ICE BofA US HY Contrained / 40% S&amp;P UBS Leverage Loan</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" xlink:to="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" priority="1"/><link:label xlink:type="resource" xlink:label="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember_2219" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">60% ICE BofA US HY Contrained / 40% S&amp;P UBS Leverage Loan_2219</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" xlink:to="label_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember_2219" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" xlink:label="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember"/><link:label xlink:type="resource" xlink:label="label_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">ICE BofA US High Yield Constrained Index</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" xlink:to="label_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" priority="1"/><link:label xlink:type="resource" xlink:label="label_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember_2219" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ICE BofA US High Yield Constrained Index_2219</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" xlink:to="label_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember_2219" priority="1"/>




<link:loc xlink:type="locator" xlink:href="#ast_CorporateBondsCTIMember" xlink:label="CorporateBondsCTIMember"/><link:label xlink:type="resource" xlink:label="label_CorporateBondsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Corporate Bonds</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CorporateBondsCTIMember" xlink:to="label_CorporateBondsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BankLoansCTIMember" xlink:label="BankLoansCTIMember"/><link:label xlink:type="resource" xlink:label="label_BankLoansCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bank Loans</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BankLoansCTIMember" xlink:to="label_BankLoansCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_CommonStocksCTIMember" xlink:label="CommonStocksCTIMember"/><link:label xlink:type="resource" xlink:label="label_CommonStocksCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Common Stocks</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CommonStocksCTIMember" xlink:to="label_CommonStocksCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConvertibleBondsCTIMember" xlink:label="ConvertibleBondsCTIMember"/><link:label xlink:type="resource" xlink:label="label_ConvertibleBondsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Convertible Bonds</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ConvertibleBondsCTIMember" xlink:to="label_ConvertibleBondsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_PreferredStocksCTIMember" xlink:label="PreferredStocksCTIMember"/><link:label xlink:type="resource" xlink:label="label_PreferredStocksCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Preferred Stocks</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PreferredStocksCTIMember" xlink:to="label_PreferredStocksCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_RightsandWarrantsCTIMember" xlink:label="RightsandWarrantsCTIMember"/><link:label xlink:type="resource" xlink:label="label_RightsandWarrantsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Rights and Warrants</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RightsandWarrantsCTIMember" xlink:to="label_RightsandWarrantsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_AssetTypeOtherAssetsandLiabilitiesCTIMember" xlink:label="AssetTypeOtherAssetsandLiabilitiesCTIMember"/><link:label xlink:type="resource" xlink:label="label_AssetTypeOtherAssetsandLiabilitiesCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">AssetType: Other Assets and Liabilities</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AssetTypeOtherAssetsandLiabilitiesCTIMember" xlink:to="label_AssetTypeOtherAssetsandLiabilitiesCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_SectorOtherAssetsandLiabilitiesSectorMember" xlink:label="SectorOtherAssetsandLiabilitiesSectorMember"/><link:label xlink:type="resource" xlink:label="label_SectorOtherAssetsandLiabilitiesSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Sector: Other Assets and Liabilities</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SectorOtherAssetsandLiabilitiesSectorMember" xlink:to="label_SectorOtherAssetsandLiabilitiesSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_UtilitiesSectorMember" xlink:label="UtilitiesSectorMember"/><link:label xlink:type="resource" xlink:label="label_UtilitiesSectorMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Utilities</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="UtilitiesSectorMember" xlink:to="label_UtilitiesSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrialSectorMember" xlink:label="IndustrialSectorMember"/><link:label xlink:type="resource" xlink:label="label_IndustrialSectorMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Industrial</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="IndustrialSectorMember" xlink:to="label_IndustrialSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnergySectorMember" xlink:label="EnergySectorMember"/><link:label xlink:type="resource" xlink:label="label_EnergySectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Energy</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EnergySectorMember" xlink:to="label_EnergySectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TechnologySectorMember" xlink:label="TechnologySectorMember"/><link:label xlink:type="resource" xlink:label="label_TechnologySectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Technology</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TechnologySectorMember" xlink:to="label_TechnologySectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_BasicMaterialsSectorMember" xlink:label="BasicMaterialsSectorMember"/><link:label xlink:type="resource" xlink:label="label_BasicMaterialsSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Basic Materials</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BasicMaterialsSectorMember" xlink:to="label_BasicMaterialsSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_FinancialSectorMember" xlink:label="FinancialSectorMember"/><link:label xlink:type="resource" xlink:label="label_FinancialSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Financial</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinancialSectorMember" xlink:to="label_FinancialSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CommunicationsSectorMember" xlink:label="CommunicationsSectorMember"/><link:label xlink:type="resource" xlink:label="label_CommunicationsSectorMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Communications</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CommunicationsSectorMember" xlink:to="label_CommunicationsSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConsumerCyclicalSectorMember" xlink:label="ConsumerCyclicalSectorMember"/><link:label xlink:type="resource" xlink:label="label_ConsumerCyclicalSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Consumer, Cyclical</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ConsumerCyclicalSectorMember" xlink:to="label_ConsumerCyclicalSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_ConsumerNonMinuscyclicalSectorMember" xlink:label="ConsumerNonMinuscyclicalSectorMember"/><link:label xlink:type="resource" xlink:label="label_ConsumerNonMinuscyclicalSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Consumer, Non-cyclical</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ConsumerNonMinuscyclicalSectorMember" xlink:to="label_ConsumerNonMinuscyclicalSectorMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_AkuminInc08312031975CTIMember" xlink:label="AkuminInc08312031975CTIMember"/><link:label xlink:type="resource" xlink:label="label_AkuminInc08312031975CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Akumin, Inc. 08/31/2031 9.75%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AkuminInc08312031975CTIMember" xlink:to="label_AkuminInc08312031975CTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" xlink:label="CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember"/><link:label xlink:type="resource" xlink:label="label_CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">CCO Holdings LLC / CCO Holdings Capital Corp. 01/15/2034 4.25%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" xlink:to="label_CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" xlink:label="PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember"/><link:label xlink:type="resource" xlink:label="label_PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Pluto Acquisition I, Inc. 09/20/2028 3M SOFR + 4.00%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" xlink:to="label_PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GrubHubHoldingsInc073120301300700PIKCTIMember" xlink:label="GrubHubHoldingsInc073120301300700PIKCTIMember"/><link:label xlink:type="resource" xlink:label="label_GrubHubHoldingsInc073120301300700PIKCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">GrubHub Holdings, Inc. 07/31/2030 13.00 (7.00 PIK)%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GrubHubHoldingsInc073120301300700PIKCTIMember" xlink:to="label_GrubHubHoldingsInc073120301300700PIKCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_EnvisionHealthcareCorpCTIMember" xlink:label="EnvisionHealthcareCorpCTIMember"/><link:label xlink:type="resource" xlink:label="label_EnvisionHealthcareCorpCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Envision Healthcare Corp.</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EnvisionHealthcareCorpCTIMember" xlink:to="label_EnvisionHealthcareCorpCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_AvayaInc080120281MSOFRPlus750CTIMember" xlink:label="AvayaInc080120281MSOFRPlus750CTIMember"/><link:label xlink:type="resource" xlink:label="label_AvayaInc080120281MSOFRPlus750CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Avaya Inc. 08/01/2028 1M SOFR + 7.50%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AvayaInc080120281MSOFRPlus750CTIMember" xlink:to="label_AvayaInc080120281MSOFRPlus750CTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" xlink:label="GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember"/><link:label xlink:type="resource" xlink:label="label_GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Global Medical Response TL B 10/02/2028 3M SOFR + 3.50%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" xlink:to="label_GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" xlink:label="GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember"/><link:label xlink:type="resource" xlink:label="label_GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Genesis Energy LP / Genesis Energy Finance Corp. 05/15/2033 8.00%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" xlink:to="label_GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_RainCarbonInc090120291225CTIMember" xlink:label="RainCarbonInc090120291225CTIMember"/><link:label xlink:type="resource" xlink:label="label_RainCarbonInc090120291225CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Rain Carbon, Inc. 09/01/2029 12.25%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RainCarbonInc090120291225CTIMember" xlink:to="label_RainCarbonInc090120291225CTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#ast_IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" xlink:label="IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember"/><link:label xlink:type="resource" xlink:label="label_IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Icahn Enterprises LP / Icahn Enterprises Finance Corp. 06/15/2030 9.00%</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" xlink:to="label_IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" priority="1"/>







	

</link:labelLink></link:linkbase></appinfo></annotation><element name="C000241324Member" id="ast_C000241324Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="C000241325Member" id="ast_C000241325Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="BloombergUSAggregateBondIndex2211BroadBasedIndexMember" id="ast_BloombergUSAggregateBondIndex2211BroadBasedIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="BloombergUSAggregateBondIndex2219BroadBasedIndexMember" id="ast_BloombergUSAggregateBondIndex2219BroadBasedIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" id="ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2211AdditionalIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" id="ast_ICEBofAUSHighYieldConstrainedIndex2211AdditionalIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" id="ast_A60ICEBofAUSHYContrained40SPUBSLeverageLoan2219AdditionalIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" id="ast_ICEBofAUSHighYieldConstrainedIndex2219AdditionalIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="CorporateBondsCTIMember" id="ast_CorporateBondsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="BankLoansCTIMember" id="ast_BankLoansCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="CommonStocksCTIMember" id="ast_CommonStocksCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="ConvertibleBondsCTIMember" id="ast_ConvertibleBondsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="PreferredStocksCTIMember" id="ast_PreferredStocksCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="RightsandWarrantsCTIMember" id="ast_RightsandWarrantsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="AssetTypeOtherAssetsandLiabilitiesCTIMember" id="ast_AssetTypeOtherAssetsandLiabilitiesCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="SectorOtherAssetsandLiabilitiesSectorMember" id="ast_SectorOtherAssetsandLiabilitiesSectorMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="BasicMaterialsSectorMember" id="ast_BasicMaterialsSectorMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="FinancialSectorMember" id="ast_FinancialSectorMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="ConsumerCyclicalSectorMember" id="ast_ConsumerCyclicalSectorMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="ConsumerNonMinuscyclicalSectorMember" id="ast_ConsumerNonMinuscyclicalSectorMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="AkuminInc08312031975CTIMember" id="ast_AkuminInc08312031975CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" id="ast_CCOHoldingsLLCCCOHoldingsCapitalCorp01152034425CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" id="ast_PlutoAcquisitionIInc092020283MSOFRPlus400CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="GrubHubHoldingsInc073120301300700PIKCTIMember" id="ast_GrubHubHoldingsInc073120301300700PIKCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="EnvisionHealthcareCorpCTIMember" id="ast_EnvisionHealthcareCorpCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="AvayaInc080120281MSOFRPlus750CTIMember" id="ast_AvayaInc080120281MSOFRPlus750CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" id="ast_GlobalMedicalResponseTLB100220283MSOFRPlus350CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" id="ast_GenesisEnergyLPGenesisEnergyFinanceCorp05152033800CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="RainCarbonInc090120291225CTIMember" id="ast_RainCarbonInc090120291225CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" id="ast_IcahnEnterprisesLPIcahnEnterprisesFinanceCorp06152030900CTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/></schema>
