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

Cohen, Judith G. (1999) The Spectra of Main-Sequence Stars in Galactic Globular Clusters. II. CH and CN Bands in M71. Astronomical Journal, 117 (5). pp. 2434-2439. ISSN 1538-3881. doi:10.1086/300860.

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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.

Item Type:Article
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URLURL TypeDescription Paper
Cohen, Judith G.0000-0002-8039-4673
Additional Information:© 1999 The American Astronomical Society. Received 1998 December 29; accepted 1999 January 25. Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the California Institute of Technology and the University of California. The entire Keck/LRIS user community owes a huge debt to Jerry Nelson, Gerry Smith, Bev Oke, and many other people who have worked to make the Keck Telescope and LRIS a reality and to operate and maintain the Keck Observatory. We are grateful to the W. M. Keck Foundation, and particularly its late president, Howard Keck, for the vision to fund the construction of the W. M. Keck Observatory. I also thank Kevin Richberg for help with the data reduction.
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:globular clusters : general - globular clusters : individual (M71) - stars : evolution
Issue or Number:5
Record Number:CaltechAUTHORS:20190528-141732422
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Official Citation:Judith G. Cohen 1999 AJ 117 2434
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95829
Deposited By: Tony Diaz
Deposited On:28 May 2019 21:25
Last Modified:16 Nov 2021 17:16

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