Other
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..888v&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 680, p. 888-893.
Other
10
Carbon, Globular Clusters, Hydrogen, Oxygen, Stellar Composition, Abundance, Binary Stars, Giant Stars
Scientific paper
An analysis of the CNO and s-process abundances in the M22 star III-106 has been completed. This star has been identified on the basis of DDO photometry by Hesser et al. (1977) and on the basis of a low-resolution spectrum by McClure and Norris (1977) as a CH star. We find the star to have C = 7.1, N = 7.65, O not greater than 7.8, and (Fe/H) = -1.4 on the usual logarithmic scale with H = 12.0 and to show no evidence for enhancement of s-process elements. From these abundances, we conclude that M22 III-106 is not a genuine CH star in the sense that designation is applied to galactic CH stars. However, this star does have an anomalously high carbon abundance when compared to other M22 giants. The most probable explanation for the carbon overabundance in III-106 is that CN processing has not been as complete in this star as in other giants of similar initial composition in M22.
Vanture Andrew D.
Wallerstein George
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