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Radiative lifetime measurements and oscillator strengths of astrophysical interest in HoIII

Författare:
Publiceringsår: 2002
Språk: Engelska
Sidor: 364-370
Publikation/Tidskrift/Serie: ASTRONOMY & ASTROPHYSICS
Volym: 384
Nummer: 1
Dokumenttyp: Artikel
Förlag: E D P SCIENCES

Sammanfattning

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.

Disputation

Nyckelord

  • Physics and Astronomy
  • atomic processes
  • stars : chemically peculiar
  • atomic data

Övriga

Published
Yes
  • ISSN: 0004-6361

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