Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7470k&link_type=abstract
HST Proposal ID #7470
Physics
Hst Proposal Id #7470 Stellar Populations
Scientific paper
HST observations of the crowded centers of globular clusters have resulted in a number of intriguing discoveries of new phenomena. We propose to extend this work to a much larger portion of the Galactic globular cluster system. We will observe the centers of 46 clusters in B and V, using the WPFC2 in snapshot mode. We will make these images publicly available 3 months after the observation date. The resulting color-magnitude diagrams will include all stars down to 1 mag below the main-sequence turnoff, and will allow us to address many outstanding questions, such as: How does the frequency of stellar interaction products, such as blue stragglers, depend upon the stellar density and dynamical state? Are there population gradients present in some high-concentration clusters? How prevalent are the strange horizontal branch morphologies recently discovered by HST, and are they confined to the cluster centers? How often is a population of hot horizontal branch stars present in metal-rich clusters, and does it correlate with the cluster dynamics? We will also be able to improve core parameters for a number of clusters, and constrain their dynamical states. Finally, the homogeneity of the dataset will allow us to find improved relative cluster ages {within < 1 Gyr}. This survey will produce a fundamental data set for a substantial number of Galactic globular clusters, which will be useful for many studies in the years to come, and will be a part of the legacy of HST.
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