Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26as...59..195c&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 59, Feb. 1985, p. 195-204. Research supported by the Consejo
Astronomy and Astrophysics
Astrophysics
35
Abundance, Late Stars, Open Clusters, Red Giant Stars, Stellar Spectrophotometry, Ubv Spectra, Cyanogen, Hydrogen, Iron, Stellar Color, Stellar Evolution
Scientific paper
UBV and DDO photometric observations of 31 red evolved stars toward 11 open clusters, obtained with the 41-cm and 91-cm telescopes at Cerro Tololo Interamerican Observatory on four nights in 1978, are reported. The data are compiled in tables and characterized for each cluster, and two criteria are used to determine the probability that a star is a member of a cluster. Six of the clusters are found to contain one evolved red star, one has two, one has four, and three have none; the other 19 stars are seen as red field objects. The estimated cluster Fe/H abundance ratios range from -0.2 to +0.3, and the red giants in the clusters NGC 2335 and NGC 2567 are found to have CN strengths like those seen in Hyades giants. The unusual weakness of the 421.6-nm band of CN for star 108 in NGC 2548 is attributed either to unusual composition and proper motion or to its nonmembership in the cluster despite meeting the photometric criteria.
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