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The Bismuth Abundance in the HGMN Stars chi Lupi and HR 7775 and Improved Atomic Data for Selected Transitions of BI I, BI II, and BI III

In English

Författare

  • Glenn Wahlgren
  • Tomas Brage
  • J. C. Brandt
  • J. Fleming
  • Sveneric Johansson
  • D. S. Leckrone
  • C. R. Proffitt
  • J. Reader
  • C. J. Sansonetti

Summary, in English

High-resolution spectra of the chemically peculiar HgMn stars chi Lupiand HR 7775, obtained with the Hubble Space Telescope/Goddard HighResolution Spectrograph, are investigated for their abundance of bismuthby comparison with LTE synthetic spectrum modeling. HR 7775, previouslyknown from International Ultraviolet Explorer spectra to display stronglines of Bi II, is determined to have bismuth present at an enhancementlevel of nearly 5 orders of magnitude from the lines Bi IIlambdalambda1436, 1902 and Bi III lambda1423. The bismuthenhancement for chi Lupi is found to be near a level of 1.5 dex, andan ionization anomaly between Bi<SUP>+</SUP> and Bi<SUP>++</SUP> isapparent. HR 7775 abundance enhancements of the heavy elements platinum,[Pt/H]=4.7 dex, and gold, [Au/H]=3.8 dex, have also been determined. Newlaboratory measurements for wavelengths and hyperfine structure patternsof Bi I/Bi II/Bi III lines are presented, as well as the results ofcalculations for hyperfine structure constants and oscillator strengthsfor selected lines of Bi II and Bi III. Based on observations with theNASA/ESA Hubble Space Telescope, obtained at the Space Telescope ScienceInstitute, which is operated by the Association of Universities forResearch in Astronomy, Inc., under NASA contract NAS5-26555.

Publiceringsår

2001

Språk

Engelska

Sidor

520-535

Publikation/Tidskrift/Serie

Astrophysical Journal

Volym

551

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

American Astronomical Society

Ämne

  • Condensed Matter Physics
  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • Stars: Individual: Bright Star Number: HR 7775
  • Stars: Individual: Constellation Name: chi Lupi
  • Stars: Chemically Peculiar
  • Atomic Data
  • Stars: Abundances
  • Ultraviolet: Stars

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0004-637X