Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...448.1207q&link_type=abstract
Astronomy and Astrophysics, Volume 448, Issue 3, March IV 2006, pp.1207-1216
Astronomy and Astrophysics
Astrophysics
16
Sun: Abundances, Atomic Data, Atomic Processes
Scientific paper
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 \varepsilonOs = 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.
Biémont É.
Jorissen Alain
Palmeri Patrick
Plez Bertrand
Quinet Pascal
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