Physics
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..183a&link_type=abstract
NOAO Proposal ID #2010B-0183
Physics
Scientific paper
Only for AGB stars does there exist observational evidence that nucleosynthesis of fluorine, as ^19F, is an ongoing process. However, we have recently derived F abundances in Galactic AGB carbon- stars and found much lower F enhancements than previously reported in the literature. This downward revision to the F abundances in Galactic stars results from much improved molecular data and model atmospheres adopted in our recent analyses. The lower F enhancements found places doubt on the real contribution of AGB stars to the chemical evolution of this element. Nevertheless, theoretical AGB models predict large primary F production at low metallicity, but this has not yet been tested observationally. Therefore, we propose to measure F abundances in extragalactic AGB C-stars covering a range in metallicity and belonging to nearby (metal-poor) galaxies. This will lead to the first derivation of F abundances in extragalactic AGB C-stars, to new constraints on nucleosynthetic models and to a better estimation of the contribution of AGB stars to the F inventory in stellar populations.
Abia Carlos
Cunha Katia
Smith Verne V.
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