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2008AJ....135.1070D - Astron. J., 135, 1070-1082 (2008/March-0)

Light element abundances in two chemically peculiar stars: HD 104340 and HD 206983.


Abstract (from CDS):

We derive carbon, nitrogen, oxygen, and lithium abundances as well as 12C/13C isotopic ratios in two chemically peculiar red giant stars: HD 104340 and HD 206983. The abundances were determined via spectrum synthesis of optical high-resolution spectra containing C2, CH, CN, [O I], and Li I lines. Our results indicate that HD 206983 is a barium star, while HD 104340, although showing enhancements of s-process elements, should not be considered as a classical barium star: its barium star nature can be explained by internal nucleosynthesis. The low metallicity giant HD 104340 can experience deeper convective mixing and, consequently, a larger dredge-up of CNO-cycle products compared to normal red giants. The light element abundance pattern of HD 104340 resembles anomalies resulting from the appearance on the stellar surface of material enriched by triple-α and CNO cycling.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: evolution - stars: individual (HD 104340, HD206983)

Simbad objects: 16

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