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Comparison of new experimental and astrophysical f-values for some RU II lines, observed in HST spectra of chi LUPI
Johansson, Sveneric G.; Joueizadeh, Ali; Litzen, Ulf; Larsson, Jorgen; Persson, Anders; Wahlstrom, Claes-Goran; Svanberg, Sune; Leckrone, David S.; Wahlgren, Glenn M.
AA(University of Lund, Lund, Sweden), AB(University of Lund, Lund, Sweden), AC(University of Lund, Lund, Sweden), AD(University of Lund, Lund, Sweden), AE(Lund Institute of Technology, Lund, Sweden), AF(Lund Institute of Technology, Lund, Sweden), AG(Lund Institute of Technology, Lund, Sweden), AH(Lund Institute of Technology, Lund, Sweden), AI(NASA. Goddard Space Flight Center, Greenbelt, MD, US)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 2, p. 809-815 (ApJ Homepage)
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NASA/STI Keywords:
Astronomical Spectroscopy, Atomic Spectra, Line Spectra, Ruthenium, Spaceborne Astronomy, Stellar Composition, Ultraviolet Astronomy, Ultraviolet Spectra, Abundance, Hubble Space Telescope, Spectrographs, Ultraviolet Spectroscopy
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We report an experimental absolute oscillator strengths for 18 UV lines of Ru II, obtained by combining laser-induced flourescence measurements of radiative lifetimes and branching fractions from line intensities in a calibrated Fourier-transform spectrum Hubble Space Telescope/Goddard High Resolution Spectrograph (HST/GHRS) observations of the spectrum of the sharp-lined B star chi Lupi contain six of these lines, for which 'astrophysical' relative f-values have been determined. The agreement is within 0.10 dex for a Ru abundance of log N(Ru)/N(H) = -7.90, which is 2.3 dex above the solar abundance.

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