Fluorine Abundances in Galactic Asymptotic Giant Branch Stars

Details Fluorine Abundances in Galactic Asymptotic Giant Branch Stars Fluorine Abundances in Galactic Asymptotic Giant Branch Stars

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...715l..94a&link_type=abstract

The Astrophysical Journal Letters, Volume 715, Issue 2, pp. L94-L98 (2010).

Astronomy and Astrophysics

Astronomy

22

Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Agb And Post-Agb, Stars: Carbon

Scientific paper

An analysis of the fluorine abundance in Galactic asymptotic giant branch (AGB) carbon stars (24 N-type, 5 SC-type, and 5 J-type) is presented. This study uses the state-of-the-art carbon-rich atmosphere models and improved atomic and molecular line lists in the 2.3 μm region. Significantly lower F abundances are obtained in comparison to previous studies in the literature. This difference is mainly due to molecular blends. In the case of carbon stars of SC-type, differences in the model atmospheres are also relevant. The new F enhancements are now in agreement with the most recent theoretical nucleosynthesis models in low-mass AGB stars, solving the long-standing problem of F in Galactic AGB stars. Nevertheless, some SC-type carbon stars still show larger F abundances than predicted by stellar models. The possibility that these stars are of larger mass is briefly discussed.

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