A New Look at the Old Cluster NGC 6791

Details A New Look at the Old Cluster NGC 6791 A New Look at the Old Cluster NGC 6791

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813302p&link_type=abstract

American Astronomical Society, AAS Meeting #218, #133.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present comprehensive cluster membership and g'r' photometry of the prototypical old, metal-rich Galactic star cluster NGC 6791. The proper motion catalog contains 58901 objects down to g'=23.5, limited to a circular area of radius 30 arcmin. The highest precision of the proper motions is 0.08 mas/yr. Our proper motions confirm cluster membership of all main and also some rare constituents of NGC 6791. The total number of probable cluster members down to g'=22 is about 4800. New findings include an extended horizontal branch in this cluster. The angular radius of NGC 6791 is at least 15 arcmin. The luminosity function of the cluster peaks at g'=18.5 and then steadily declines toward fainter magnitudes. We note a presence of differential reddening in NGC 6791 and argue that it is a more plausible agent to produce the observed dichotomy of main sequence near the turn-off.
This work is supported in part by a NSF grant 09-08114 to JHU.

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