Light Element Abundances in Two Chemically Peculiar Stars: HD 104340 and HD 206983

Details Light Element Abundances in Two Chemically Peculiar Stars: HD 104340 and HD 206983 Light Element Abundances in Two Chemically Peculiar Stars: HD 104340 and HD 206983

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aj....135.1070d&link_type=abstract

The Astronomical Journal, Volume 135, Issue 3, pp. 1070-1082 (2008).

Astronomy and Astrophysics

Astronomy

13

Stars: Abundances, Stars: Chemically Peculiar, Stars: Evolution, Stars: Individual: Hd 104340: Hd206983

Scientific paper

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.
Based on the observations made with the 1.52 m telescope at the European Southern Observatory (La Silla, Chile) under the agreement with Observatório Nacional (Brazil).

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