On the relationship between giant-branch color and metallicity for globular clusters

Details On the relationship between giant-branch color and metallicity for globular clusters On the relationship between giant-branch color and metallicity for globular clusters

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..588m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Aug. 1984, p. 588-592.

Astronomy and Astrophysics

Astronomy

13

Globular Clusters, Metallicity, Stellar Color, Astronomical Spectroscopy, Iron

Scientific paper

The empirical relationship between giant branch color (B-Y)O,g and high abundances of Fe/H in globular clusters is analyzed. In the analysis data for 34 different globular clusters are used to derive reddening values and the mean spectroscopic errors for E(B - V). Good agreement was found between the empirical relation and a relation derived from stellar evolution theory. The relation implies Fe/H abundances of 0.6 (+ or - 0.2) for the clusters M71 and 47 Tuc. This result is compared with results obtained from high-resolution spectroscopy of red giants in globular clusters, and some of the possible effects of nonsolar abundance ratios on the Fe/H (B - V) calibration are discussed.

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