CCD BV photometry of the old open cluster NGC 6791

Details CCD BV photometry of the old open cluster NGC 6791 CCD BV photometry of the old open cluster NGC 6791

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..492k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, April 1, 1990, p. 492-497.

Astronomy and Astrophysics

Astronomy

33

Astronomical Photometry, Charge Coupled Devices, Open Clusters, Variable Stars, Visual Photometry, Blue Stars, Color-Magnitude Diagram, Early Stars, Globular Clusters, Star Formation, White Dwarf Stars

Scientific paper

CCD BV photometry to V = 20.5 of stars in the old open cluster NGC 6791 is presented. Comparison with the theoretical isochrones of VandenBerg gives a cluster age in the range of 10 to 12.5 Gyr, and an apparent distance modulus of 13.45 mag, adopting a solar metallicity. This cluster is only marginally younger than Palomar 12, which is the youngest globular cluster known. A search for short-period variables in the cluster field led to the discovery of only one low-amplitude variable, probably belonging to the FK Com-type stars. A very blue star was detected which may be an extremely young white dwarf formed in the cluster.

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