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Radiative lifetime measurements and oscillator strengths of astrophysical interest in HoIII

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Author

  • Zhiguo Zhang
  • Gabriel Somesfalean
  • Sune Svanberg
  • P Palmeri
  • P Quinet
  • E Biemont

Summary, in English

Radiative lifetimes of three long-lived levels belonging to the 4f(10)5d 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&VERBAR;r&VERBAR;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.

Department/s

Publishing year

2002

Language

English

Pages

364-370

Publication/Series

Astronomy & Astrophysics

Volume

384

Issue

1

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • atomic processes
  • stars : chemically peculiar
  • atomic data

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-6361