Discovery of Fluorine in Cool Extreme Helium Stars

Details Discovery of Fluorine in Cool Extreme Helium Stars Discovery of Fluorine in Cool Extreme Helium Stars

2006-08-11

arxiv.org/abs/astro-ph/0608237v1

Astrophys.J.648:L143-L146,2006

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, accepted to ApJ letters

Scientific paper

10.1086/507888

Neutral fluorine (F I) lines are identified in the optical spectra of cool EHe stars. These are the first identification of F I lines in a star's spectrum, and provide the first measurement of fluorine abundances in EHe stars. The results show that fluorine is overabundant in EHe stars. The overabundance of fluorine provides evidence for the synthesis of fluorine in these stars, that is discussed in the light of asymptotic giant branch (AGB) evolution, and the expectation from accretion of an He white dwarf by a C-O white dwarf.

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