Statistics – Applications
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5969f&link_type=abstract
HST Proposal ID #5969
Statistics
Applications
Hst Proposal Id #5969 Stellar Populations
Scientific paper
Our long term goal is to obtain very accurate photometric data of a complete sample of Post-Main Sequence {PMS} stars over the entire area of the cluster for a sample of ``prototype'' Galactic Globular Cluster {GGCs}. During Cycle 4, 6 hours have been allocated to this program for observing the intermediate metallicity GGC M3. With the present program we shall take WFPC2 observations {in UV, U, V, and I bands} of M92, a very low metallicity GGC. The acquisition of a complete sample of PMS stars will allow us to construct Luminosity Functions {LFs} of stars in any PMS phase. LFs are the most powerful observable tool for testing stellar evolutionary models {e.g. the accuracy of the input physics, the reliability of canonical assumptions, etc.} and have useful applications in several areas, providing, e.g., the most accurate check of the ``stellar clock'' used in dating globular clusters. Our large samples also survey very fast evolutionary and rare {trace} stellar types {e.g. UV-bright stars, blue stragglers, binaries} along with their radial distributions, which will provide fundamental information for internal cluster dynamics and for the origin of UV light from elliptical galaxies. In addition, a pair of very deep exposures in V,I will be taken at two external positions, where the crowding is less severe. These will be used to study the faint end of the luminosity and mass functions of main sequence stars as a function of radial distance.
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