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   <!--Date: Fri Feb 24 16:43:53 GMT 2012-->
   
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            <SubmissionLog>Assigned ID: 470
----- Attempting Submission 1 (Fri Feb 24 16:43:53 GMT 2012) -----</SubmissionLog>
            
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   <ProposalInformation
      Category="AR"
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      Cycle="20"
      STScIEditNumber="0">
      
      <Title>Dynamics of Binary Stars in Multiple Population Globular Clusters</Title>
      
      <Abstract>Spectroscopic and photometric observations indicate that globular clusters (GCs) host multiple stellar populations.  This discovery challenges the standard view of GC formation, in which GCs are `simple stellar populations' composed of stars of uniform age and chemical composition.  This proposal is aimed at studying how the presence of multiple stellar generations and the substructure arising from the formation of second-generation stars can affect the evolution and disruption of binary stars.  Binary interactions play a key role in determining GC dynamical evolution and the abundance of exotic stellar populations (e.g. low-mass X-ray binaries, blue stragglers, millisecond pulsars).  Understanding binary dynamics in the context of the emerging paradigm of multiple-population GCs is an important step toward deciphering the dynamical history behind their current observed properties.

By means of an extensive survey of N-body simulations, we will follow the evolution of the fraction of binaries, their spatial distribution, and the evolution of the orbital properties of the survivors.  Our simulations will allow us to investigate the differences between the properties of first- and second-generation binaries and explore how they arise from differences in the initial structural properties and subsequent dynamical evolution of first- and second-generation stars. Our study will shed light on how the observed properties of binariescan be used as a tool to gain a deeper understanding of the formation and dynamical history of multiple-population GCs.</Abstract>
      
      <PrincipalInvestigator
         Honorific="Dr."
         FirstName="Enrico"
         LastName="Vesperini"
         ESAMember="false"
         UniqueID="4779"
         Institution="Drexel University"
         Country="USA"
         State="PA" />
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Steve"
         LastName="McMillan"
         ESAMember="false"
         UniqueID="7285"
         Institution="Drexel University"
         Country="USA"
         State="PA"
         AdminUSPI="false"
         Contact="false" />
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Francesca"
         LastName="D'Antona"
         ESAMember="true"
         UniqueID="3740"
         Institution="INAF, Osservatorio Astronomico di Roma"
         Country="ITA"
         AdminUSPI="false"
         Contact="false" />
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Annibale"
         LastName="D'Ercole"
         ESAMember="true"
         UniqueID="5501"
         Institution="INAF, Osservatorio Astronomico di Bologna"
         Country="ITA"
         AdminUSPI="false"
         Contact="false" />
      
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         NextCycle2GyroPrimary="0"
         NextCycle2GyroParallel="0"
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      <Phase1ProposalInformation
         TotalTargets="1"
         Attachment="C:\Users\admin\Desktop\proposal1\finalproposal.pdf">
         
         <ScientificCategory>RESOLVED STELLAR POPULATIONS</ScientificCategory>
         
         <ScientificKeyword1
            Keyword="Cluster Binary Stars And Blue Stragglers" />
         
         <ScientificKeyword2
            Keyword="Dynamics" />
         
         <ScientificKeyword3
            Keyword="Globular Clusters" />
         
         <ScientificKeyword4
            Keyword="Resolved Stellar Populations" />
         
         <ProprietaryPeriod>12</ProprietaryPeriod>
         
         <Budget>Medium</Budget>
         
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         <Availability>SUPPORTED</Availability>
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