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

Cohen, Judith G. (1999) The Spectra of Main-Sequence Stars in Galactic Globular Clusters. I. CH and CN Bands in M13. Astronomical Journal, 117 (5). pp. 2428-2433. ISSN 0004-6256. doi:10.1086/300843.

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Spectra with a high signal-to-noise ratio of 50 stars that 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 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.

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URLURL TypeDescription Paper
Cohen, Judith G.0000-0002-8039-4673
Additional Information:© 1999. The American Astronomical Society. Received 1998 November 17; accepted 1999 January 25. 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 Jim Hesser for a guide to the literature on 47 Tuc, Kevin Richberg for help with the data reduction, and Patrick Shopbell for help at the telescope.
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:globular clusters: general; globular clusters: individual (M13) ; stars: evolution
Issue or Number:5
Record Number:CaltechAUTHORS:20170408-135703580
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Official Citation:Judith G. Cohen 1999 AJ 117 2428
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75892
Deposited By: 1Science Import
Deposited On:14 Apr 2017 19:00
Last Modified:15 Nov 2021 16:55

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