The Discovery of Fluorine in Cool Extreme Helium Stars

2006/08/11 by Gajendra Pandey · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Scientific Research and Discoveries #astro-ph

paper · pdf · doi:10.1086/507888

published as Astrophys.J.648:L143-L146,2006 · 14 pages, 3 figures, accepted to ApJ letters

arxiv created 2006/08/11 · openalex publication_date 2006/08/21 · arxiv updated 2011/02/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31

Abstract

Neutral fluorine (F I) lines are identified in the optical spectra of cool extreme helium (EHe) stars. These are the first F I lines identified in a star's spectrum, and they 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 us with evidence for the synthesis of fluorine in these stars, which is discussed in light of asymptotic giant branch evolution and the expectation from accretion of an He white dwarf by a C-O white dwarf.

Citations

• Fluorine Abundances in the Large Magellanic Cloud and Centauri: Evidence for Neutrino Nucleosynthesis?
• The Evolution and Explosion of Massive Stars. II. Explosive Hydrodynamics and Nucleosynthesis

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