Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aca....42...29k&link_type=abstract
Acta Astronomica (ISSN 0001-5237), vol. 42, no. 1, 1992, p. 29-47. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
98
Astronomical Photometry, Blue Stars, Open Clusters, Stellar Evolution, Color-Magnitude Diagram, Star Distribution, Stellar Luminosity, Stellar Mass, Subdwarf Stars
Scientific paper
The paper presents BVI(c) photometry of about 7000 stars from the field of the old open cluster NGC 6791. Also obtained is the photometry of about 2000 stars located in the four comparison fields located around the cluster. The radial extent of NGC 6791 is at least 9.3 arcmin, and its central radius is r(c) about 124 arcsec. The contribution of the field stars to the different parts of the cluster color magnitude diagrams (V vs. B-V and V vs. V-I) is studied. NGC 6791 possesses about 47 blue stragglers and about 55 yellow stragglers. It harbors about 174 red giants, 22 of them horizontal branch stars. Seven candidates for sdB/sdO subdwarfs were discovered in the cluster field. Under assumption of cluster membership they possess M(v) between 3.6 and 4.8 and (B-V)0 between -0.35 and -0.14. The color index of the bluest sdB/sdO candidate provides an upper limit on the cluster reddening E(B-V = 0) not greater than 0.195. The observed luminosity function of NGC 6791 is more or less constant for V between 17.5 and 21.0 and then brakes due to increasing incompleteness of the photometry. The conservative lower limit on the cluster total mass is 4070 solar masses.
Kaluzny Janusz
Udalski Andrzej
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