Other
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..382l&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, May 1985, p. 382-392. Research supported by Colorad
Other
21
Cyanogen, Giant Stars, Globular Clusters, Metallicity, Stellar Composition, Absorption Spectra, Asymptotic Giant Branch Stars, Carbon, Nitrogen, Regression Analysis, Stellar Spectrophotometry
Scientific paper
Recent work indicates that both the observed carbon and nitrogen abundances and the bimodal 3883 A cyanogen distributions that are often observed in moderately metal-poor globular clusters fit easily into a simple mixing scenario in which C-N nucleosynthesis proceeds at different rates in otherwise similar stars. It is shown that there is no evidence for a difference in (C+N)/Fe between CN-strong and CN-weak stars in moderately metal-poor globular clusters. Carbon and nitrogen are approximately equally abundant in CN-strong stars in M3, M13, and M5; carbon is more abundant than nitrogoen in otherwise similar CN-weak giants and less abundant in CN-weak AGB stars. The observed carbon and nitrogen abundances imply that the product of C and N is only 1.3 to 2 times larger in a typical CN-strong giant than in a comparable CN-weak giant. The distribution of 3883 A CN band strengths appears to be bimodal because the band saturates for values of C x N near its maximum. There is no evidence for a bimodal distribution in the strengths of the weaker violet CN bands. The observed values of C/Fe and N/Fe can account, at least approximately, for the strengths of the observed bimodal 3883 A cyanogen bands in moderately metal-poor stars. The 3883 A cyanogen band strengths observed in M3, M13, and M5 suggest shifts of approximately +0.2 dex and -0.2 dex in the zero points of the Lick carbon and nitrogen abundance scales.
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