The Bottom of the Main Sequence in the Old, Metal-Rich Cluster, NGC 6791

Details The Bottom of the Main Sequence in the Old, Metal-Rich Cluster, NGC 6791 The Bottom of the Main Sequence in the Old, Metal-Rich Cluster, NGC 6791

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9815k&link_type=abstract

HST Proposal ID #9815

Physics

Hst Proposal Id #9815 Stellar Populations

Scientific paper

We propose a photometric study of the lowest part of the main sequence of NGC 6791, an old, rich open cluster whose metallicity is considerably higher than solar. The cluster is rich enough that a single ACS/WFC field will have ample stars for the study. For the faintest stars, proper-motion separation of cluster from field is essential; hence we include Cycle 14 observations. These should give us a color-magnitude diagram and luminosity function that reach into the region of the hydrogen-burning limit, thus extending the study of the latter into a new domain of metallicity. Observational data of this type will allow theoreticians to check many aspects of their theories of stellar structure. We also expect to see the white dwarf sequence of the cluster. Our team has experience with studies of this type, and has provided the geometric-distortion calibration of ACS.

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