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2006-03-04 - Article/Dans un journal avec peer-review - Anglais - 10 page(s)

Quinet Pascal , Palmeri Patrick , Biémont Emile , Jorissen A., Van Eck S., Svanberg S., Xu H.-L., Plez B., "Transition probabilities and lifetimes in neutral and singly ionized osmium and the Solar osmium abundance" in Astronomy and Astrophysics, 448, 3, 1207-1216

  • Edition : EDP Sciences, Les Ulis (France)
  • Codes CREF : Physique solaire (DI1456), Physique atomique et moléculaire (DI1220), Astrophysique (DI1455), Mécanique quantique classique et relativiste (DI1211)
  • Unités de recherche UMONS : Astrophysique et spectroscopie (S804)
Texte intégral :

Abstract(s) :

(Anglais) 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 eOs = 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.

Identifiants :
  • DOI : 10.1051/0004-6361:20053852