The Spectra of Main Sequence Stars in Galactic Globular Clusters II. CH and CN Bands in M71

Details The Spectra of Main Sequence Stars in Galactic Globular Clusters II. CH and CN Bands in M71 The Spectra of Main Sequence Stars in Galactic Globular Clusters II. CH and CN Bands in M71

1999-01-26

arxiv.org/abs/astro-ph/9901369v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the AJ to appear back to back with paper I. 14 pages with 5 figures

Scientific paper

10.1086/300860

Spectra with a high signal-to-noise ratio of 79 stars which are just below the main sequence turnoff of M71 are presented. They yield indices for the strength of the G band of CH and the ultraviolet CN band at 3885 \AA. These indices are each to first order bimodal and they are anti-correlated. There are approximately equal numbers of CN weak/CH strong and CN strong/CH weak main sequence stars in M71. It is not yet clear whether these star-to-star variations arise from primordial variations or from mixing within a fraction of individual stars as they evolve.

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