Transition probabilities and lifetimes in neutral and singly ionized osmium and the Solar osmium abundance
Författare
Summary, in English
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.
Avdelning/ar
Publiceringsår
2006
Språk
Engelska
Sidor
93-1207
Publikation/Tidskrift/Serie
Astronomy & Astrophysics
Volym
448
Issue
3
Fulltext
- Available as PDF - 263 kB
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Dokumenttyp
Artikel i tidskrift
Förlag
EDP Sciences
Ämne
- Atom and Molecular Physics and Optics
Nyckelord
- Sun : abundances
- atomic data
- atomic processes
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0004-6361