CNO Abundances of Bright Giants in the Globular Clusters M3 and M13

Details CNO Abundances of Bright Giants in the Globular Clusters M3 and M13 CNO Abundances of Bright Giants in the Globular Clusters M3 and M13

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.1511s&link_type=abstract

Astronomical Journal v.112, p.1511

Astronomy and Astrophysics

Astronomy

74

Globular Clusters: M3, Globular Clusters: M13, Stars: Giant

Scientific paper

Spectra of the λ4300 CH and λ3883 CN bands have been obtained for a sample of red giants in M3 and Mi 3 for which [0/Fe] abundances have been published in the literature. Measurements of the [C/Fe] and [N/Fe] abundances have been made by comparing the observed spectra with synthetic spectra calculated from model atmospheres. Giants in both clusters exhibit an anticorrelation between CN band strength and both [0/Fe] and [C/Fe] abundances, coupled with a CN-[N/Fe] correlation. The total [(C+ N+ 0)/Fe] abundance is the same within the observational uncertainties among both CN-strong and CN-weak giants. These observations are in accord with the hypothesis that and C→N O→N processed material has been brought to the surface of the CN-strong cluster giants.

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