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The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II

På svenska

Author

  • J. C. Pickering
  • M. P. Donnelly
  • Hampus Nilsson
  • A. Hibbert
  • Sveneric Johansson

Summary, in English

We report on experimental branching fractions (BFs) for 19 transitions from the three 3d 5( 6S)4s4p( 3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 Å. Absolute oscillator strengths ( f-values) have been derived by combining the BFs with experimental radiative lifetimes recently reported in the literature. Theoretical f-values have been calculated using configuration interaction wavefunctions. The new experimental and theoretical f-values are compared with data available in the literature and in databases. The strongest lines measured belong to the UV 8 multiplet of Fe II, which has one ground state transition appearing as a prominent feature at 1608 Å in interstellar spectra. The line is accompanied by a satellite at 1611 Å due to a level mixing, which is discussed in the paper.

Publishing year

2002

Language

English

Pages

715-722

Publication/Series

Astronomy & Astrophysics

Volume

396

Issue

2

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • atomic data -- line: identification -- techniques: spectroscopic -- stars: abundances -- ISM: abundances

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-6361