Abstract
view Abstract Citations (75) References (42) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS An Analysis of G-Band Strengths in NGC 6397 and M55 Red Giants Briley, Michael M. ; Bell, R. A. ; Hoban, Susan ; Dickens, R. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: August 1990 DOI: 10.1086/169066 Bibcode: 1990ApJ...359..307B Keywords: Abundance; Globular Clusters; Red Giant Stars; Stellar Spectra; Astronomical Models; Asymptotic Giant Branch Stars; Hertzsprung-Russell Diagram; Metallicity; Stellar Evolution; Astrophysics; CLUSTERS: GLOBULAR; STARS: ABUNDANCES; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (42)
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