A search for cyanogen variations on the lower giant branch of M3

Details A search for cyanogen variations on the lower giant branch of M3 A search for cyanogen variations on the lower giant branch of M3

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..255n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 1, 1984, p. 255-260.

Astronomy and Astrophysics

Astrophysics

28

Abundance, Cyanogen, Giant Stars, Globular Clusters, Stellar Spectrophotometry, Variable Stars, Late Stars, Stellar Color, Stellar Luminosity, Stellar Magnitude, Stellar Models

Scientific paper

Spectra have been obtained for 16 giants in the globular cluster M3. These show that variations in the strength of the 3883-A cyanogen band persist among stars down to the magnitude limit of the sample, which is M(v) = + 1.2(V = 16.2). This is fainter by aobut 1.6 mag than the luminosity at which the meridional circulation model of Sweigart and Mengel (1979) predicts that CN variations should originate. This constrasts with an earlier report by Suntzeff (1980). The present data also show that, in the mean, the 4300-A G band is weaker in the spectra of the CN-rich stars than it is in those of the CN-poor stars, supporting Suntzeff's discovery of a carbon-nitrogen abundance anticorrelation. There is only weak evidence for a CN-Al correlation on the giant branch of M3, and no evidence for variations in the strength of the Ca II H and K parameter A(Ca).

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