THEORETICAL OSCILLATOR-STRENGTHS FOR SR-II AND Y-III, WITH APPLICATION TO ABUNDANCES IN THE HGMN-TYPE STAR CHI-LUPI

Authors
BRAGE T WAHLGREN GM JOHANSSON SG LECKRONE DS PROFFITT CR
Citation
T. Brage et al., THEORETICAL OSCILLATOR-STRENGTHS FOR SR-II AND Y-III, WITH APPLICATION TO ABUNDANCES IN THE HGMN-TYPE STAR CHI-LUPI, The Astrophysical journal, 496(2), 1998, pp. 1051-1057
Citations number
50
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
496
Issue
2
Year of publication
1998
Part
1
Pages
1051 - 1057
Database
ISI
SICI code
0004-637X(1998)496:2<1051:TOFSAY>2.0.ZU;2-I
Abstract
Oscillator strengths for selected transitions of Sr II and Y III have been determined using ab initio multiconfiguration Hartree-Fock techni ques. The importance of including an accurate treatment of the core-va lence 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 de x 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.