Theoretical oscillator strengths for Sr II and Y III, with application to abundances in the HgMn-type star chi Lupi
Brage, Tomas; Wahlgren, Glenn; Johansson, Sveneric; Leckrone, DS, et al. (1998). Theoretical oscillator strengths for Sr II and Y III, with application to abundances in the HgMn-type star chi Lupi. Astrophysical Journal, 496, (2), 1051 - 1057
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Published
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English
Authors:
Brage, Tomas
;
Wahlgren, Glenn
;
Johansson, Sveneric
;
Leckrone, DS
, et al.
Department:
Faculty of Science
Department of Physics
Lund Observatory - Has been reorganised
Abstract:
Oscillator strengths for selected transitions of Sr II and Y III have been determined using ab initio multiconfiguration Hartree-Fock techniques. The importance of including an accurate treatment of the core-valence correlation is emphasized. The results are used to determine the abundances of Sr and Y in the chemically peculiar star chi Lupi from HST/GHRS Echelle spectra. Overabundances of 2.09 dex for Sr and 2.8 dex for Y relative to the solar abundance are derived, and an ionization imbalance of +1.1 dex is evident from abundance determinations using Y III and Y II.
Keywords:
atomic data ;
abundances ;
stars ;
individual (chi Lupi)
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