Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..585m&link_type=abstract
The Astronomical Journal, vol. 108, no. 2, p. 585-593
Astronomy and Astrophysics
Astronomy
45
Charge Coupled Devices, Infrared Photometry, Metallicity, Stellar Color, Stellar Spectrophotometry, Color-Color Diagram, Color-Magnitude Diagram, Interstellar Extinction
Scientific paper
We have investigated the reddening and metallicity of NGC 6791 using photoelectric and Charge Coupled Devices (CCD) photometry at the KPNO 0.9 m telescope. The reddenings to 31 photoelectrically measured stars in the direction of the cluster were determined individually yielding a mean E(B - V) = 0.10 plus or minus 0.02. Broadband UBVI CCD images were taken with a 512x512 CCD and included deep frames on the center, plus a 3x3 mosaic of the cluster. With this reddening the UBV 2-color diagram for the cluster does not match the standard solar-metallicity 2-color diagram. The substantial Ultra Violet (UV) deficiency requires the cluster to be metal rich. Regardless of the choice of reddening value, if we make the assumption of solar metallicity for the cluster we cannot simultaneously derive a consistent fit of the 2-color diagram to standard 2-color sequences and the color-magnitude diagram to published isochrones. A comparison with solar-metallicity isochrones provides only an upper limit of approximately 10 Gyrs for the age for the cluster.
Janes Kenneth A.
Montgomery Kent Alan
Phelps Randy Lee
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