Fluorine in R Coronae Borealis Stars

Details Fluorine in R Coronae Borealis Stars Fluorine in R Coronae Borealis Stars

2007-11-15

arxiv.org/abs/0711.2363v1

Astronomy and Astrophysics

Astrophysics

25 pages, 7 figures, accepted to ApJ

Scientific paper

10.1086/526492

Neutral fluorine (F I) lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these stars. Fluorine is enriched in some RCBs by factors of 800 to 8000 relative to its likely initial abundance. The overabundances of fluorine are evidence for the synthesis of fluorine. These results are discussed in the light of the scenario that RCBs are formed by accretion of an He white dwarf by a C-O white dwarf. Sakurai's object (V4334 Sgr), a final He-shell flash product, shows no detectable F I lines.

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