EDP Sciences
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Volume 384, Number 1, March II 2002
Page(s) 364 - 370
Section Atomic and molecular data
DOI http://dx.doi.org/10.1051/0004-6361:20020014

A&A 384, 364-370 (2002)
DOI: 10.1051/0004-6361:20020014

Radiative lifetime measurements and oscillator strengths of astrophysical interest in Ho III

Z. G. Zhang1, G. Somesfalean1, S. Svanberg1, P. Palmeri2, P. Quinet2, 3 and E. Biémont2, 3

1  Department of Physics, Lund Institute of Technology, PO Box 118, 22100 Lund, Sweden
2  Astrophysique et Spectroscopie, Université de Mons-Hainaut, 7000 Mons, Belgium
3  IPNAS, Bât. B15, Université de Liège, Sart Tilman, 4000 Liège, Belgium

(Received 26 July 2001 / Accepted 14 December 2001)

Radiative lifetimes of three long-lived levels belonging to the 4f 105d 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.

Key words: atomic data -- atomic processes -- stars: chemically peculiar

Offprint request: E. Biémont, E.Biemont@ulg.ac.be

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