The Region of the Hydrogen-Burning Limit in Omega Centauri and 47 Tucanae

Details The Region of the Hydrogen-Burning Limit in Omega Centauri and 47 Tucanae The Region of the Hydrogen-Burning Limit in Omega Centauri and 47 Tucanae

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9444k&link_type=abstract

HST Proposal ID #9444

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #9444

Scientific paper

We propose a photometric study of the lower main sequences of Omega Cen and 47 Tuc, down to the region of the H-burning limit, which the deeper faintness limit of ACS will allow us to reach. For the faintest stars, proper-motion separation of cluster from field is essential; hence we include Cycle 13 observations. The resulting color-magnitude diagrams {CMDs} and luminosity functions {LFs} will allow study of stars in a mass regime and metallicity that have never been accessible before, and will serve as an important check on theories of the structure of low-mass stars. Our CMDs will check the luminosity-radius relation, while the faint end of the LF can be used to check the mass-luminosity relation. With 47 Tuc we extend these checks to a higher metallicity than before, while in Omega Cen we investigate the effect of a range of metallicity within a single cluster. In both clusters we will produce the faintest existing MS and WD sequences, and the faintest LF. With this proposal we initiate high-precision astrometry with ACS using the state-of-the-art techniques that we have developed for WFPC2. A separate proposal addresses the geometric distortion of ACS, but we can do well in the present work even with approximate distortion corrections, as we can if necessary confine our measurements to relative positions of closely neighboring stars.

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