M3: AN Ideal Laboratory for Testing Stellar Evolution and Dynamics: CYCLE4 High

Details M3: AN Ideal Laboratory for Testing Stellar Evolution and Dynamics: CYCLE4 High M3: AN Ideal Laboratory for Testing Stellar Evolution and Dynamics: CYCLE4 High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5496f&link_type=abstract

HST Proposal ID #5496

Computer Science

Hst Proposal Id #5496 Cool Stars Old Clusters

Scientific paper

We propose WFPC2 observations of the Galactic globular cluster M3 in UVI and the mid-UV (F218W). This will be the first COMPLETE sample of Post-main sequence stars over the entire area of the cluster. It will allow the most stringent test of stellar evolutionary models and will yield crucial observational input for the study of star interactions and dynamics within a cluster. The results should have wide applicability including: (1) the most accurate test of the ``stellar clock'' used in dating globular clusters; (2) a complete survey of very fast evolutionary stages 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. The cluster M3 is the ideal target for this purpose. We already have ground-based photometry of about 18000 stars: the best complete CMD, the largest complete Luminosity Function for Post-MS stars, and the largest sample of blue straggler stars (BSS) ever obtained for a globular cluster from the ground. The tests we propose require even larger samples which can only be achieved by observing the cluster core which is not resolved from the ground.

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