Carbon abundances in red giant stars in the globular clusters M92 and NGC 6397

Details Carbon abundances in red giant stars in the globular clusters M92 and NGC 6397 Carbon abundances in red giant stars in the globular clusters M92 and NGC 6397

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..604b&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 604-623. NSF-supported research.

Other

95

Abundance, Carbon, Globular Clusters, Red Giant Stars, Atmospheric Models, Late Stars, Line Spectra, Spectrum Analysis, Stellar Models, Stellar Spectra

Scientific paper

Results of carbon-abundance determinations based on synthetic spectrum analyses are presented for the two metal-poor globular clusters, M92 and NGC 6397. Representative color-magnitude diagrams are examined, and synthetic spectra, synthetic colors, and model atmospheres are calculated. Observed and computed spectra are compared, and photometric data are also analyzed. The results indicate a weakening of the G-band strength for most stars along the upper giant branches in both clusters, including even the coolest stars at the tip of the giant branch. This weakening of the G band is shown to correspond to a carbon depletion such that the logarithmic carbon abundance relative to all other elements except H and He lies between -0.5 and -1.0.

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