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   Phase2ID="14285"
   Phase="Phase I"
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   <ProposalInformation
      Category="AR"
      PureParallelProposal="false"
      Cycle="23"
      STScIEditNumber="0">
      
      <Title>The Young Star Groups in Dwarf Galaxies</Title>
      
      <Abstract>Dwarf galaxies are the building blocks of all galaxies observed today, but  star formation is still an ill-understood process in these unevolved systems. This archival project aims at obtaining a comprehensive census of all young (&lt;100 Myr) clusters and associations in a complete sample of dwarfs within the local ~3.5 Mpc. ACS and/or WFPC2 images in V and I exist for all the galaxies, and these will be supplemented by ground based UBR and H-alpha images, most already available, to obtain full spectral energy distributions (SEDs) for all sources at UBVRHaI. Bayesian routines that implement stochastic sampling of the stellar Initial Mass Function will be used to obtain physical parameters (age, mass, extinction) for the sources from their SEDs. Our novel approach for the identification of clustered structures indicates a ten--fold improvement in the statistics of clusters/associations over existing literature. We will use the data to investigate (1) whether the dearth of ionizing photons in dwarfs is an effect of deficiency in the production of massive stars, and (2) provide robust estimates for the cluster formation efficiencies in these low star formation rate systems. Our study, and the resulting catalogs of clusters and associations, will maximally leverage the HST archival holdings in order to place dwarfs more securely within the broader perspective of galaxies as a whole, and will provide a unique resource for the broader community.</Abstract>
      
      <PrincipalInvestigator
         Honorific="Prof."
         FirstName="Daniela"
         LastName="Calzetti"
         ESAMember="false"
         Retired="false"
         UniqueID="2979"
         Institution="University of Massachusetts - Amherst"
         Country="USA"
         State="MA"
         Contact="true" />
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Jennifer"
         LastName="Andrews"
         ESAMember="false"
         Retired="false"
         UniqueID="8536"
         Institution="University of Arizona"
         Country="USA"
         State="AZ"
         Contact="false"
         AdminUSPI="false" />
      
      <CoInvestigator
         Honorific="Mr."
         FirstName="David"
         LastName="Cook"
         ESAMember="false"
         Retired="false"
         UniqueID="12317"
         Institution="University of Wyoming"
         Country="USA"
         State="WY"
         Contact="false"
         AdminUSPI="false" />
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Mark"
         MiddleInitial="R."
         LastName="Krumholz"
         ESAMember="false"
         Retired="false"
         UniqueID="7780"
         Institution="University of California - Santa Cruz"
         Country="USA"
         State="CA"
         Contact="false"
         AdminUSPI="false" />
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Daniel"
         LastName="Dale"
         ESAMember="false"
         Retired="false"
         UniqueID="6169"
         Institution="University of Wyoming"
         Country="USA"
         State="WY"
         Contact="false"
         AdminUSPI="false" />
      
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         Attachment="/Users/calzetti/daniela/hst/cy23/Archive_IMF/ANGST_Clusters_v4.pdf"
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         <ScientificCategory>UNRESOLVED STAR FORMATION</ScientificCategory>
         
         <ScientificKeyword1
            Keyword="Dwarf Galaxies" />
         
         <ScientificKeyword2
            Keyword="HII Regions" />
         
         <ScientificKeyword3
            Keyword="Star Formation" />
         
         <ScientificKeyword4
            Keyword="Young Star Clusters In External Galaxies" />
         
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         <Budget>Regular</Budget>
         
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         <MultiCycleTreasury>false</MultiCycleTreasury>
         
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         <Availability>SUPPORTED</Availability>
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         RetrievalPlan="Retrieval of higher level products through the HLA" />
      
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         RetrievalMethod="FTP"
         RetrievalPlan="Retrieval of higher level produtcs through the HLA, where possible" />
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