Theoretical oscillator strengths for Sr II and Y III, with application to abundances in the HgMn-type star chi Lupi

Summary, in English

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.

• Författare: Tomas Brage; Glenn Wahlgren; Sveneric Johansson; DS Leckrone; CR Proffitt
• Avdelning/ar: Naturvetenskapliga fakulteten; Fysiska institutionen; Astronomi - Har omorganiserats
• Publiceringsår: 1998
• Språk: Engelska
• Sidor: 1051-1057
• Publikation/Tidskrift/Serie: Astrophysical Journal
• Volym: 496
• Issue: 2
• Länkar: http://dx.doi.org/10.1086/305401
• Dokumenttyp: Artikel i tidskrift
• Förlag: American Astronomical Society
• Ämne: Astronomy, Astrophysics and Cosmology
• Nyckelord: atomic data; abundances; stars; individual (chi Lupi)
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0004-637X