Computer Science
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..234v&link_type=abstract
NOAO Proposal ID #2002B-0234
Computer Science
Scientific paper
The populous open cluster NGC 6791 is approximately 8 Gyr old, yet substantially richer in heavy elements than the Sun ([Fe/H]=+0.4). These rare properties make NGC 6791 a critical local template population for chemical enrichment studies and for the spectral and photometric dating of spiral galaxy bulges and elliptical galaxies. While NGC 6791 has enjoyed considerable attention, its distance (m-M=13.4, 4.8 kpc) has precluded observations of main sequence stars below 0.7 solar masses. With a few hours of observations with Gemini/NIRI we can measure the main sequence in NGC 6791 down to 0.2 solar mass stars in the colors that are most sensitive to cool main sequence stars and least sensitive to the line-of-sight absorption (Av=0.66). Comparison of the proposed observations with stellar models will allow us to increase the precision in the cluster Helium abundance by a factor of two and measure for the first time the colors of low mass metal-rich stars. We will also probe the dynamical state and IMF of this important cluster.
Chaboyer Brian
Hippel Ted von
Jensen Joe
Sarajedini Ata
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