Fluorine abundances in galactic asymptotic giant branch stars
2010 (English)In: Astrophysical Journal, ISSN 2041-8205, Vol. 715, no 2, L94-L98 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2010. Vol. 715, no 2, L94-L98 p.
nuclear reactions, nucleosynthesis, abundances, stars: abundances, stars: AGB and post-AGB, stars: carbon
IdentifiersURN: urn:nbn:se:uu:diva-136055DOI: 10.1088/2041-8205/715/2/L94ISI: 000278591800007OAI: oai:DiVA.org:uu-136055DiVA: diva2:376122