Transition probabilities and lifetimes in neutral and singly ionized osmium and the Solar osmium abundance

P Quinet, P Palmeri, E Biemont, A Jorissen, S Van Eck, Sune Svanberg, Huailiang Xu, B Plez

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Abstract

Radiative lifetime measurements have been performed, with a time-resolved laser-induced fluorescence technique, for 12 levels of Os I and for 9 levels of Os II. For 9 levels of Os I and 4 levels of Os II, there were no previous experimental data available. From a comparison with new theoretical calculations, taking configuration interactions and core-polarization effects into account, it has been possible to deduce oscillator strengths for 129 transitions of Os I and 137 transitions of Os II of astrophysical interest appearing in the wavelength range 180.0-870.0 nm. These results have allowed us to revise the abundance of osmium in the solar photosphere (log epsilon(Os) = 1.25 +/- 0.11). The newly derived oscillator strengths have been applied as well to derive the osmium abundance in the carbon-rich metal-poor star HD 187861.
Original languageEnglish
Pages (from-to)1207-U93
JournalAstronomy & Astrophysics
Volume448
Issue number3
DOIs
Publication statusPublished - 2006

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Keywords

  • Sun : abundances
  • atomic data
  • atomic processes

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