Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9799r&link_type=abstract
HST Proposal ID #9799
Physics
Hst Proposal Id #9799 Stellar Populations
Scientific paper
The globular clusters toward the Galactic bulge remain among the least studied of the Galaxy's globular clusters, primarily because severe photometric crowding has hinderred ground-based imaging. We propose a snapshot survey {3 month proprietary period} using ACS onboard HST to produce a complete sample of color-magnitude diagrams for these clusters. The high spatial resoltuion of HST gives photometry vastly superor to even the best ground-based color-magnitude diagrams. Mesurement of the horizontal and red giant branches gives reddening and distance, from which physical parameters for the clusters are derived. Ages to be derived are of special interest because this population may contain the oldest clusters in the Galaxy. Additionally, the separation of cluster members from contaminating field stars will give far superior structural parameters than can be derived from the ground. Many of these clusters have especially concentrated cores; due to their proximity to the Galactic Center, they may have experienced far greater dynamical evolution due to bulge shocking. If stellar encounters are capable of modifying stellar populations, these clusters probably are the best place to look for such effects. Because ground-based study of these clusters has been so difficult, we believe that this survey is potentially an important part of HST's legacy.
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