The Very-Low-Mass Star Content of the Globular Cluster NGC 6397

Details The Very-Low-Mass Star Content of the Globular Cluster NGC 6397 The Very-Low-Mass Star Content of the Globular Cluster NGC 6397

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6797k&link_type=abstract

HST Proposal ID #6797

Physics

Hst Proposal Id #6797 Stellar Populations

Scientific paper

Very few constraints exist on the population of very-low-mass stars in globular clusters. Observations with HST have come close to reaching the hydrogen-burning limit at the lower end of the main sequence in the globular cluster NGC 6397, the cluster with lowest distance modulus. Determination of the faintest part of the luminosity function is limited, however, by serious field-star contamination. This proposal is to take second-epoch images for determination of proper motions of individual faint stars. Tests of the positional accuracy that we now achieve show that over the time baseline that will be available by Cycle 6, separation of cluster members from field stars will be close to perfect. This will allow us to extend the measurable main-sequence luminosity function two magnitudes beyond its present limit, to I ~eq 25, or V ~eq 28, which corresponds to an absolute-magnitude of M_V ~eq 15.7. This will allow us to come closer than anyone ever has to the hydrogen-burning limit at the bottom of the main sequence.

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