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1999AJ....117.2434C - Astron. J., 117, 2434-2439 (1999/May-0)
The spectra of main-sequence stars in galactic globular clusters. II. CH and CN bands in M71.
COHEN J.G.
Abstract (from CDS):
Spectra with a high signal-to-noise ratio of 79 stars that 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 Å. These indices are each to first-order bimodal and they are anticorrelated. 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.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Globular Clusters: General - Galaxy: Globular Clusters: Individual: Messier Number: M71 - Stars: Evolution
Nomenclature: Table 1: [C99] M71ms BHHMMSSs+DDMMSS N=78.
Simbad objects: 81
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