CN and CH variations among giants in the globular cluster M2

Details CN and CH variations among giants in the globular cluster M2 CN and CH variations among giants in the globular cluster M2

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..533s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 533-542.

Astronomy and Astrophysics

Astrophysics

22

Cyano Compounds, Globular Clusters, Hydrocarbons, Red Giant Stars, Stellar Composition, Late Stars, Metallicity, Stellar Spectra

Scientific paper

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.

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