DDO and UBV photometry of red giant stars in NGC 6791

Journal Article · Sat Dec 01 04:00:00 EST 1984 · Publ. Astron. Soc. Pac.; (United States)

DOI:https://doi.org/10.1086/131462· OSTI ID:5703645

Janes, K A

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 + or - 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. 14 references.

• Research Organization: Boston Univ., MA
• OSTI ID: 5703645
• Journal Information: Publ. Astron. Soc. Pac.; (United States), Journal Name: Publ. Astron. Soc. Pac.; (United States) Vol. 96; ISSN PASPA
• Country of Publication: United States
• Language: English

Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
DISTANCE
GALAXY CLUSTERS
GIANT STARS
PHOTOMETRY
RED GIANT STARS
STARS