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1994PASP..106..201G - Publ. Astron. Soc. Pac., 106, 201-201 (1994/February-0)
A study of the UV-bright stars in omega Centauri and the type II cepheid ST Puppis.
GONZALEZ G.
Abstract (from CDS):
The abundances of 26 elements were calculated for 5 UV-bright stars in omega Cen and ST Pup from high resolution CCD spectra. Compared to the giants, the most luminous UV-bright stars in omega Cen display significant enhancements of the CNO and s-process elements. The CNO enhancements correlate with s-process enhancemenets in general in omega Cen, implying that these two sets of elements are mixed with the atmosphere together. The UV-bright stars also show an apparent deficiency of Al; the most likely cause of this is mass loss combined with a small NLTE effect. An analysis of the s-process element abundances demonstrates that the average time integrated neutron flux, t_0, for the most luminous UV-bright stars in omega Cen, V1, and ROA 24, is about 0.6 mbarn^-1. The observed s-process abundance patterns are also consistent with theoretical AGB models. The amount of s-process element enhancement observed in V1 and ROA 24 requires that about 0.1% of their atmopheres be composed of material mixed to the surface from the s-processed region. The abundance patterns of ST Pup are significantly different from those in any star in omega Cen. While it displays enhanced CNO abundances, its s-process abundances are much less than those of the omega Cen stars. It most closely resembles the field CH stars.
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