Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1121s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 1121-1129. Research supported by the National Research Council of C
Astronomy and Astrophysics
Astronomy
34
Cyanogen, Globular Clusters, Red Giant Stars, Stellar Evolution, Stellar Spectrophotometry, Opacity, Spectral Energy Distribution, Stellar Atmospheres
Scientific paper
New spectroscopic data are presented that reveal that the red giants in the globular cluster NGC 6934 exhibit a bimodal CN distribution. Clear evidence for an anticorrelation between the strengths of the 3883 A CN and the 4300 A CH bands is found. An analytical formalism for calculating the variation of CN opacity with carbon abundance is discussed and compared with the results of spectrum-synthesis calculations. It is found that in the absence of significant CO formation the CN opacity reaches a maximum at a carbon depletion of about 0.22 dex. Significant CO formation in relatively cool atmospheres causes the CN opacity to peak at smaller carbon depletions. These results imply that in CN-poor stars located in clusters that exhibit bimodal CN distributions must be relatively unmixed. A bimodal CN distribution within a globular cluster need not imply an underlying bimodal carbon abundance distribution.
Bell Roger A.
Smith Graeme H.
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