Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..343g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 15, 1992, p. 343-354. Research supported by N
Other
30
Abundance, Asymptotic Giant Branch Stars, F Stars, Stellar Composition, Stellar Evolution, Cyano Compounds, Interstellar Matter, Stellar Atmospheres
Scientific paper
We present a detailed analysis of high-quality spectra of the F0Ibp star, ROA 24, in ω Cen. The wide spectral coverage allows us to positively identify 28 chemical elements. The C, N, O, Na and s-process elements are significantly enhanced relative to the other giants in ω Cen. The large C implies that 3α products have been brought to the surface. The amount of s-process element enhancement combined with the relative abundances of the s-process elements in R0A24 requires that 10 per cent of the envelope be composed of material exposed to a neutron exposure of τ0=0.36. We also observe an extreme overdeficiency of A1. Taking all available data together we conclude that ROA24 is either undergoing a blue loop on the upper Asymptotic Giant Branch (AGB) or is already a post-AGB star.
Gonzalez Guillermo
Wallerstein George
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