CN and CH variations among giants in the globular cluster M2
Journal Article
·
· Astrophysical Journal; (USA)
- Mount Stromlo and Siding Spring Observatories, Canberra (Australia) Mount Wilson and Las Campanas Observatories, Pasadena, CA (USA)
A spectroscopic survey has been made of the distribution of 3883 CN and 4300 CH band strengths among a sample of red giants in the globular cluster M2 (NGC 7089). The data are consistent with the majority of giants following a bimodal distribution of CN strengths, with the CN-strong giants exhibiting weaker CH bands than the CN-weak giants of comparable magnitude. However, two stars in the present sample appear to be CH stars, one of which was discovered previously by Zinn. Consequently, M2 provides the only known example of a cluster in which both bimodal CN distributions and CH stars exist. 86 refs.
- OSTI ID:
- 6865489
- Journal Information:
- Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 353; ISSN ASJOA; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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