7979(  1) - 04/16/98 14:04  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      7979
                                                       Version: 1
                                                       Check-in Date: 16-Apr-1998
                                                                      14:02:47

1.Proposal Title:
Globular Cluster Systems Of Spiral Galaxies
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2. Proposal For  3. Cycle
AR               7
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4. Investigators
                                                                                     Contact?
    PI: Keith Ashman                      University of Kansas
   CoI: Steve Zepf                        Yale University                               N
   CoI: Brad Whitmore                     Space Telescope Science Institute             N
   CoI: Abi Saha                          Kitt Peak National Observatory                N

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5. Abstract

We propose to to study the globular cluster systems of twenty spiral galaxies that
have been imaged in HST Cepheid distance scale programs. Our primary goal is to
measure the number of globular clusters around these galaxies. This will roughly
triple the number of spiral galaxy globular cluster systems for which such
information is available. We will also obtain metallicity estimates for these
globular cluster systems, providing an even greater increase in the number of
systems with such data. The present paucity of information on spiral galaxy globular
cluster systems is the limiting factor in using globular cluster systems to
constrain and motivate models of galaxy formation. Our program will also greatly
improve constraints on the formation efficiency of globular clusters in spirals,
thereby helping the development of globular cluster formation models. Finally, our
analysis will significantly tighten the constraints on the location and possible
variations of the peak of the globular cluster luminosity function (GCLF). In
addition to constraining models concerning the formation and destruction of globular
clusters, such information is vital if the GCLF is to realize its full potential as
a cosmological distance indicator.
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  Data Distribution

  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:
  Email:
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                                                7979(  1) - 04/16/98 14:04  - [  2]

            Summary Form for Proposal  7979

  Item                         Used in this proposal
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  Proposal Category            AR
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