High-resolution spectra of stars in globular clusters. VI - Oxygen-deficient red giant stars in M13

Details High-resolution spectra of stars in globular clusters. VI - Oxygen-deficient red giant stars in M13 High-resolution spectra of stars in globular clusters. VI - Oxygen-deficient red giant stars in M13

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1693b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, May 1991, p. 1693-1698. New York Community Trust-supported research.

Astronomy and Astrophysics

Astronomy

75

Globular Clusters, Red Giant Stars, Stellar Composition, Stellar Spectra, Abundance, Carbon Isotopes, Nitrogen, Oxygen

Scientific paper

From high-resolution, high signal-to-noise spectra, abundances of carbon, nitrogen, and oxygen and the C-12/C-13 ratio for five red giants in M13, including star II-67, which has previously been reported to be deficient in oxygen have been determined. Three of the five stars exhibit substantial oxygen deficiencies; O/Fe values range from +0.5 to less than about 0.3. The sum of the CNO nuclides is the same for all stars, which is interpreted as evidence that mixing of CNO-cycled material into the envelope is the cause of the variations in oxygen abundance.

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