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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

Wahlgren, Glenn LU ; Brage, Tomas LU ; Brandt, J. C.; Fleming, J.; Johansson, Sveneric LU ; Leckrone, D. S.; Proffitt, C. R.; Reader, J. and Sansonetti, C. J. (2001) In Astrophysical Journal 551(1). p.520-535
Abstract
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... (More)
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. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Stars: Individual: Bright Star Number: HR 7775, Stars: Individual: Constellation Name: chi Lupi, Stars: Chemically Peculiar, Atomic Data, Stars: Abundances, Ultraviolet: Stars
in
Astrophysical Journal
volume
551
issue
1
pages
520 - 535
publisher
University of Chicago Press
external identifiers
  • wos:000168152200045
ISSN
0004-637X
DOI
10.1086/320063
language
English
LU publication?
yes
id
d8635508-227f-411f-b81a-73a0eedaf433 (old id 130205)
date added to LUP
2007-07-20 14:28:33
date last changed
2016-04-16 04:42:15
@article{d8635508-227f-411f-b81a-73a0eedaf433,
  abstract     = {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&lt;SUP&gt;+&lt;/SUP&gt; and Bi&lt;SUP&gt;++&lt;/SUP&gt; 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.},
  author       = {Wahlgren, Glenn and Brage, Tomas and Brandt, J. C. and Fleming, J. and Johansson, Sveneric and Leckrone, D. S. and Proffitt, C. R. and Reader, J. and Sansonetti, C. J.},
  issn         = {0004-637X},
  keyword      = {Stars: Individual: Bright Star Number: HR 7775,Stars: Individual: Constellation Name: chi Lupi,Stars: Chemically Peculiar,Atomic Data,Stars: Abundances,Ultraviolet: Stars},
  language     = {eng},
  number       = {1},
  pages        = {520--535},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {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},
  url          = {http://dx.doi.org/10.1086/320063},
  volume       = {551},
  year         = {2001},
}