Published May 1999
| Published + Accepted Version
Journal Article
Open
The Spectra of Main-Sequence Stars in Galactic Globular Clusters. II. CH and CN Bands in M71
- Creators
-
Cohen, Judith G.
Abstract
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.
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.Attached Files
Published - Cohen_1999_AJ_117_2434.pdf
Accepted Version - 9901369.pdf
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9901369.pdf
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Additional details
- Eprint ID
- 95829
- Resolver ID
- CaltechAUTHORS:20190528-141732422
- W. M. Keck Foundation
- Created
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2019-05-28Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field