Lifetime measurements for ground term transitions in TaII, WII, and ReII

Research output: Contribution to journalArticle

Abstract

Lifetime measurements have been made for the radiation emitted in the ground term transitions of the nominal form 5s(2)5p(6)5d(x)6s-5s(2)5p(6)5d(x)6p in Ta II (x = 3), W II (x = 4), and Re II (x = 5). Supporting theoretical calculations have also been performed to characterize configuration interaction and to estimate the degree of decay branching of the upper levels. The lifetime measurements have been combined with these theoretical considerations and with branching fractions deduced from the emission measurements of Corliss & Bozman to specify the oscillator strengths of these transitions. The results are discussed in the context of spectroscopic data obtained from orbiting telescopes and applied to Hubble Space Telescope spectra to estimate the tungsten abundance in Sirius.

Details

Authors
  • M Henderson
  • RE Irving
  • R Matulioniene
  • LJ Curtis
  • DG Ellis
  • GM Wahlgren
  • Tomas Brage
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences

Keywords

  • ultraviolet : stars, stars : peculiar, Lupi), chi, stars : individual (Sirius B, atomic data, stars : abundances
Original languageEnglish
Pages (from-to)805-810
JournalAstrophysical Journal
Volume520
Issue number2
Publication statusPublished - 1999
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Physics, science (011013100)