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Abundance and isotopic anomalies of thallium in the atmosphere of the HgMn star chi Lupi

Leckrone, DS; Johansson, Sveneric LU ; Kalus, Gabriele LU ; Wahlgren, Glenn LU ; Brage, Tomas LU and Proffitt, CR (1996) In Astrophysical Journal 462(2). p.937-942
Abstract
We announce the detection of two fully resolved hyperfine components of the intercombination line of Tl II (Z = 81) at 1908.6 Angstrom in the ultraviolet spectrum of the sharp-lined, nonmagnetic, chemically peculiar star chi Lupi (BB.5pHgMn + A2 Vm). The wavelengths and profiles of these absorption lines strongly suggest that they arise from the heaviest isotope, Tl-205. The echelle observations were obtained with the Hubble Space Telescope Goddard High Resolution Spectrograph (HST/GHRS). Spectrum synthesis fits to the line profiles yield a logarithmic overabundance of thallium, relative to the solar system abundance, of +3.8 dex. We believe this to be the first detection of thallium in a star other than the Sun. It is also the first time... (More)
We announce the detection of two fully resolved hyperfine components of the intercombination line of Tl II (Z = 81) at 1908.6 Angstrom in the ultraviolet spectrum of the sharp-lined, nonmagnetic, chemically peculiar star chi Lupi (BB.5pHgMn + A2 Vm). The wavelengths and profiles of these absorption lines strongly suggest that they arise from the heaviest isotope, Tl-205. The echelle observations were obtained with the Hubble Space Telescope Goddard High Resolution Spectrograph (HST/GHRS). Spectrum synthesis fits to the line profiles yield a logarithmic overabundance of thallium, relative to the solar system abundance, of +3.8 dex. We believe this to be the first detection of thallium in a star other than the Sun. It is also the first time hyperfine structure has been resolved in the satellite ultraviolet spectrum of an astrophysical source. The large overabundance and the presence of only the heaviest isotope of the element continue the pattern observed previously in chi Lup for platinum (Z = 78), gold (Z = 79), and mercury (Z = 80). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
abundances, individual (chi Lupi), stars, peculiar
in
Astrophysical Journal
volume
462
issue
2
pages
937 - 942
publisher
University of Chicago Press
external identifiers
  • wos:A1996UH18700034
ISSN
0004-637X
DOI
10.1086/177206
language
English
LU publication?
yes
id
4057059b-6693-43a1-bdab-f81faca7cc67 (old id 3919587)
date added to LUP
2013-07-09 08:35:50
date last changed
2016-04-16 03:53:09
@article{4057059b-6693-43a1-bdab-f81faca7cc67,
  abstract     = {We announce the detection of two fully resolved hyperfine components of the intercombination line of Tl II (Z = 81) at 1908.6 Angstrom in the ultraviolet spectrum of the sharp-lined, nonmagnetic, chemically peculiar star chi Lupi (BB.5pHgMn + A2 Vm). The wavelengths and profiles of these absorption lines strongly suggest that they arise from the heaviest isotope, Tl-205. The echelle observations were obtained with the Hubble Space Telescope Goddard High Resolution Spectrograph (HST/GHRS). Spectrum synthesis fits to the line profiles yield a logarithmic overabundance of thallium, relative to the solar system abundance, of +3.8 dex. We believe this to be the first detection of thallium in a star other than the Sun. It is also the first time hyperfine structure has been resolved in the satellite ultraviolet spectrum of an astrophysical source. The large overabundance and the presence of only the heaviest isotope of the element continue the pattern observed previously in chi Lup for platinum (Z = 78), gold (Z = 79), and mercury (Z = 80).},
  author       = {Leckrone, DS and Johansson, Sveneric and Kalus, Gabriele and Wahlgren, Glenn and Brage, Tomas and Proffitt, CR},
  issn         = {0004-637X},
  keyword      = {abundances,individual (chi Lupi),stars,peculiar},
  language     = {eng},
  number       = {2},
  pages        = {937--942},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {Abundance and isotopic anomalies of thallium in the atmosphere of the HgMn star chi Lupi},
  url          = {http://dx.doi.org/10.1086/177206},
  volume       = {462},
  year         = {1996},
}