Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...384..364z&link_type=abstract
Astronomy and Astrophysics, v.384, p.364-370 (2002)
Astronomy and Astrophysics
Astrophysics
11
Atomic Data, Atomic Processes, Stars: Chemically Peculiar
Scientific paper
Radiative lifetimes of three long-lived levels belonging to the 4f105d configuration of Ho III have been measured, for the first time, using the time-resolved laser-induced fluorescence technique. A good agreement between the experimental lifetimes and theoretical results obtained within a multiconfigurational pseudo-relativistic Hartree-Fock (HFR) approach including core-polarization (CP) effects is observed provided an adequate scaling factor is applied to the <4f|r|5d> transition matrix element. From the comparison theory-experiment, it has been possible to assess the reliability of the oscillator strengths of the 4f-5d transitions of astrophysical interest, particularly for the lines depopulating the levels considered in the present work. The present results fill in a gap concerning the f-values of doubly ionized holmium and are needed for a quantitative evaluation of the holmium abundance in some peculiar stars.
Biémont É.
Palmeri Patrick
Quinet Pascal
Somesfalean G.
Svanberg Sune
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