Fluorine Abundances in Galactic AGB Stars

Details Fluorine Abundances in Galactic AGB Stars Fluorine Abundances in Galactic AGB Stars

2010-04-26

arxiv.org/abs/1004.4451v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

16 pages, 3 figures, Accepted in ApJ Letters

Scientific paper

An analysis of the fluorine abundance in Galactic 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 {\mu}m region. F abundances significantly lower are obtained in comparison to previous study in the literature. The main reason of this difference is 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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