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

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

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Abstract

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.
Original languageEnglish
Pages (from-to)715-722
JournalAstronomy & Astrophysics
Volume396
Issue number2
DOIs
Publication statusPublished - 2002

Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology

Keywords

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

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