Other
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233..367c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, July 15, 1988, p. 367-393. SERC-supported research
Other
14
Centaurus Constellation, Globular Clusters, Stellar Composition, Stellar Spectra, Chemical Composition, Color-Magnitude Diagram, Heavy Elements, Metallic Stars, Oxygen
Scientific paper
Blue spectra at a resolution of 0.5 A of 21 red giants in the globular cluster Omega Centauri were obtained to test Sweigart and Mengel's (1979) theory of mixing of nuclearly processed material to the star's surface, and to elucidate the relationship between primordial and evolutionary origins for the range in abundance within Omega Cen. Synthetic spectra were calculated from model atmospheres and were fitted to the observational data to determine abundances of C, N, Fe, and other heavy elements. Carbon and nitrogen abundances are found to be anticorrelated, indicating the occurrence of mixing. The 'red' group of giants is shown to be clearly divided into two groups according to the proportion of processed material in the envelope. For the 'blue' group, evidence for a decrease in carbon abundance with luminosity is found. It is suggested that mixing is likely to have occurred at an earlier evolutionary stage than that predicted or observed.
Caldwell S. P.
Dickens R. J.
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