An analysis of G-band strengths in NGC 6397 and M55 red giants

Details An analysis of G-band strengths in NGC 6397 and M55 red giants An analysis of G-band strengths in NGC 6397 and M55 red giants

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..307b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 20, 1990, p. 307-318. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

65

Abundance, Globular Clusters, Red Giant Stars, Stellar Spectra, Astronomical Models, Asymptotic Giant Branch Stars, Hertzsprung-Russell Diagram, Metallicity, Stellar Evolution

Scientific paper

A spectroscopic index which measures the strength of the G band has been determined for a number of red giants in the very metal-poor globular clusters NGC 6397 and M55. An analysis of these indices indicates a clear pattern of decreasing carbon abundances as a function of increasing evolutionary state in NGC 6397. The asymptotic giant branch (AGB) stars in NGC 6397 appear to have anomalous weak G bands compared to red giant branch stars of similar color. The weak G-band effect appears to be largely the results of a mild carbon depletion typical of evolved metal-poor stars which has been exaggerated by the lower surface gravities of AGB stars. Nitrogen abundances have also determined for the five brightest stars in NGC 6397.

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