Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8153k&link_type=abstract
HST Proposal ID #8153
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #8153 Stellar Populations In Clusters
Scientific paper
This is a continuation of a program that has extended the color-magnitude diagram and luminosity function of NGC 6397 into the neighborhood of the hydrogen-burning limit {GO-6797, King et al. 1998}. Accurate astrometry, over a baseline of a few years, allows an excellent proper-motion separation of faint cluster stars from the numerically dominant field stars. We propose to take second-epoch images of a second field in NGC 6397, so as to double the sparse numbers for that cluster, and to take second-epoch images of two rich fields near the center of M4, plus a more outlying field. This second cluster, with a different metallicity, will provide an even larger number of faint stars than NGC 6397. The resulting color-magnitude diagrams and luminosity functions will present an exciting challenge to theoreticians, as a test of both the mass-radius and mass-luminosity relations for the observable stars of lowest mass.
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