期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 715, 期 2, 页码 L94-L98出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/715/2/L94
关键词
nuclear reactions, nucleosynthesis, abundances; stars: abundances; stars: AGB and post-AGB; stars: carbon
资金
- MEC [AYA2008-04211-C02-02, FPA2008-03908]
- CNRS/INSU, France
- Swedish Research Council
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 mu m 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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