9203(  1) - 12/20/00 23:41  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9203
                                                       Version: 1
                                                       Check-in Date: 20-Dec-2000
                                                                      23:33:56

1.Proposal Title:
Comparisons of Local Group Stellar Populations: Construction of a Public Database
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2. Proposal For  3. Cycle
AR               10
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4. Investigators
                                                                                     Contact?
    PI: Jon Holtzman                      New Mexico State University
   CoI: Dr. Rene Walterbos                New Mexico State University                   N
   CoI: Dr. Andrew Dolphin                NOAO                                          N
   CoI: Dr. Cristina Afonso               New Mexico State University                   N

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5. Abstract

We propose a continuation of a Cycle 9 archival proposal to construct a public
database of stellar photometry of resolved stellar populations within Local Group
galaxies. We will use this database to compare stellar population characteristics of
different regions in the Local Group differentially, avoiding some of the
complications of comparisons with stellar evolution models, and to synthesize the
results. In particular, we will address the following issues: 1) What are the
relative ages of the oldest populations in Milky Way neighbors? 2) To what degree is
star formation is ``bursty'' in different Local Group galaxies? 3) Is there direct
evidence for variations in the IMF in nearby galaxies? 4) What is the ``average
cosmic star formation history" for dwarf galaxies in the Local Group? 5)What is the
amount of mechanical and radiative energy input into the ISMs of different galaxies
by massive stars? This proposal is a continuation of a successful archival proposal
from last year (Cycle 9), the need for which was anticipated in last year's
proposal. The current proposal shows results from initial work on the stellar
populations of a subset of Local Group dwarfs that demonstrate that we can generate
quality photometry and clearly suggest interesting returns.
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                                                9203(  1) - 12/20/00 23:41  - [  2]

            Summary Form for Proposal  9203

  Item                         Used in this proposal
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  Proposal Category            AR
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