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

In English

Författare

  • M Henderson
  • RE Irving
  • R Matulioniene
  • LJ Curtis
  • DG Ellis
  • GM Wahlgren
  • Tomas Brage

Summary, in English

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.

Publiceringsår

1999

Språk

Engelska

Sidor

805-810

Publikation/Tidskrift/Serie

Astrophysical Journal

Volym

520

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

American Astronomical Society

Ämne

  • Physical Sciences

Nyckelord

  • ultraviolet : stars
  • stars : peculiar
  • Lupi)
  • chi
  • stars : individual (Sirius B
  • atomic data
  • stars : abundances

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0004-637X