DDO and UBV photometry of red giant stars in NGC 6791

Details DDO and UBV photometry of red giant stars in NGC 6791 DDO and UBV photometry of red giant stars in NGC 6791

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..977j&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Dec. 1984, p. 977-980.

Astronomy and Astrophysics

Astronomy

31

Abundance, Electrophotometry, Galactic Clusters, Red Giant Stars, Stellar Spectrophotometry, Ubv Spectra, Interstellar Extinction, Open Clusters, Stellar Composition

Scientific paper

Photoelectric DDO and UBV observations of red giant stars in the old open cluster NGC 6791 were used to help derive the reddening to the cluster and to find its distance and metallicity. A comparison of the DDO photometry with previous results leads to a reddening estimate of E(B - V) = 0.10 + or - 0.03 mag. With this reddening, the DDO metallicity index, delta(CN) = 0.026 + or - 0.015, corresponding approximately to Fe/H = -0.08 ± 0.07. There is no evidence for a spread in composition on the cluster giant branch. Although the composition appears to be nearly solar, lingering uncertainty as to the reddening to the cluster and a possible systematic error in UBV photometry prevents a definitive statement of its properties. Additional photometry is desirable.

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