High resolution study of different groups of stars in the peculiar globular cluster Omega CEN

Details High resolution study of different groups of stars in the peculiar globular cluster Omega CEN High resolution study of different groups of stars in the peculiar globular cluster Omega CEN

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..267f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 2, Feb. 1988, p. 267-277.

Astronomy and Astrophysics

Astrophysics

36

Globular Clusters, Nuclear Fusion, Stellar Composition, Stellar Evolution, Abundance, Carbon Monoxide, Cyanogen, Metallicity

Scientific paper

Six stars in the peculiar globular cluster Omega Cen have been analyzed. Three of them belong to the CO-normal group of Persson et al. (1980). These three stars have very similar patterns of element abundances: the 'even' light elements show the same overabundance as in the field halo stars, but the 'odd' light elements are more abundant in the globular-cluster stars than in the field stars. In the three stars, the rare earths are overdeficient, as in the similar field stars. In the CO-rich group of stars, on the contrary, there are different abundance patterns. In all these stars, Ba and Y are clearly enhanced (less deficient than Fe); this is therefore an indication of some kind of mixing between the deep layers and the atmosphere of the star. The CN-rich star has a very high abundance of Al. The sixth star shows evidence of mass loss. It has almost all the characteristics of the CO-normal group of stars, but the abundnace of Na is very low.

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