The Spectra of Main Sequence Stars in Galactic Globular Clusters I. CH and CN Bands in M13

Abstract

Spectra with a high signal-to-noise ratio of 50 stars which are just below the main sequence turnoff and are members of M13 are presented. They yield indices for the strength of the CH and the ultraviolet CN band. There is no evidence for a variation in the strength of either feature from star to star in this intermediate-metallicity galactic globular cluster, and thus no evidence for primordial variations in the abundance of C and N in M13. This supports the hypothesis that abundance variations found among the light elements in the evolved stars of M13 by Suntzeff (1981), and commonly seen on the giant and subgiant branches of globular clusters of comparable metallicity, are due primarily or entirely to mixing within a fraction of individual stars as they evolve.

Accepted for publication in the AJ, to appear back to back with paper II, 15 pages with 5 figures

References in corpus (6)

• The Spectra of Main Sequence Stars in Galactic Globular Clusters II. CH and CN Bands in M71
• The Production of Sodium and Aluminum in Globular Cluster Red Giant Stars
• The Binary Nature of the Subgiant CH Stars
• Caltech Faint Galaxy Redshift Survey VII: Data Analysis Techniques and Redshifts in the Field J0053+1234
• Blue Horizontal Branch Stars in M92
• The Spectra of Main Sequence Stars in Galactic Globular Clusters I. CH and CN Bands in M13

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