Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326l..57p&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 326, March 15, 1988, p. L57-L60.
Astronomy and Astrophysics
Astrophysics
60
Abundance, Giant Stars, Globular Clusters, Oxygen, Forbidden Transitions, Metallicity, Stellar Composition, Stellar Evolution, Stellar Spectra
Scientific paper
The abundance of oxygen has been determined for six giant stars in the metal-poor globular cluster M92 from high-resolution, CCD echelle spectra. The abundance of oxygen varies from star to star and is anti-correlated with the abundance of nitrogen determined by Carbon et al. (1982), in such a way that the sum of the carbon, nitrogen, and oxygen abundances remains constant at + 0.03 + or - 0.05, despite large variations in the abundance of nitrogen from star to star. The constancy of C + N + O suggests that the abundance differences are due to variation in the degree of mixing, and not to initial differences in the amount of C + N + O. Furthermore, the anticorrelation of oxygen and nitrogen suggests that the ON cycle has been active to modify the surface C + N + O abundances in M92 giants. M92 giants also contain only a small excess of oxygen relative to iron; an oxygen excess may not be cited to reduce the derived age of the cluster.
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