A Snapshot Survey of Galactic Globular Clusters

Details A Snapshot Survey of Galactic Globular Clusters A Snapshot Survey of Galactic Globular Clusters

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8723p&link_type=abstract

HST Proposal ID #8723

Computer Science

Hst Proposal Id #8723 Stellar Populations

Scientific paper

HST observations of crowded centers of globular clusters {GCs} have produced intriguing discoveries of new phenomena, most of which are not understood theoretically. We propose here a continuation of two Cycle 7 and Cycle 8 snapshot proposals, to extend such work to a much larger portion of the Galactic GC system. Up to now less than 40 percent of the Cycle 7-8 targets have been observed, with results that have been so fruitful that we propose to complete the original target list, continuing to observe the centers in B and V with WPFC2. We request a proprietary period of only 3 months. Our color-magnitude diagrams will include all stars down to 1^ m below the main-sequence turnoff, allowing us to address many outstanding questions, such as: How does the frequency of confirmed or suspected stellar interaction products e.g., blue stragglers, horizontal branch {HB} tails depend upon the local stellar density and the cluster dynamical state? How common are the strange HB morphologies recently discovered by HST in several GCs, and are they confined to the central regions? How often do metal-rich GCs have a hot HB, and does it correlate with the cluster dynamics? We will also improve the core parameters for a number of GCs, and constrain their dynamical states. This survey will produce a fundamental data set of Galactic GCs, which will be useful for a large number of studies in the years to come, and be a part of the legacy of HST.

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