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Nils Ryde

Nils Ryde

Professor

Nils Ryde

Fluorine in the Solar neighborhood : No evidence for the neutrino process

Author

  • H. Jönsson
  • N. Ryde
  • E. Spitoni
  • F. Matteucci
  • K. Cunha
  • V. V. Smith
  • K H Hinkle
  • M. Schultheis

Summary, in English

Asymptotic giant branch (AGB) stars are known to produce "cosmic" fluorine, but it is uncertain whether these stars are the main producers of fluorine in the solar neighborhood or if any of the other proposed formation sites, Type II supernovae (SNe II) and/or Wolf-Rayet (W-R) stars, are more important. Recent articles have proposed both AGB stars and SNe II as the dominant sources of fluorine in the solar neighborhood. In this paper we set out to determine the fluorine abundance in a sample of 49 nearby, bright K giants for which we previously have determined the stellar parameters, as well as alpha abundances homogeneously from optical high-resolution spectra. The fluorine abundance is determined from a 2.3 μm HF molecular line observed with the spectrometer Phoenix. We compare the fluorine abundances with those of alpha-elements mainly produced in SNe II and find that fluorine and the alpha-elements do not evolve in lockstep, ruling out SNe II as the dominating producers of fluorine in the solar neighborhood. Furthermore, we find a secondary behavior of fluorine with respect to oxygen, which is another evidence against the SNe II playing a large role in the production of fluorine in the solar neighborhood. This secondary behavior of fluorine will put new constraints on stellar models of the other two suggested production sites: AGB stars and W-R stars.

Department/s

  • Lund Observatory

Publishing year

2017-01-20

Language

English

Publication/Series

Astrophysical Journal

Volume

835

Issue

1

Document type

Journal article

Publisher

American Astronomical Society

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: abundances
  • solar neighborhood
  • stars: abundances

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-637X