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Gabriele Kalus

Intendent

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

Författare

  • DS Leckrone
  • Sveneric Johansson
  • Gabriele Kalus
  • Glenn Wahlgren
  • Tomas Brage
  • CR Proffitt

Summary, in English

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).

Avdelning/ar

  • Astronomi - Har omorganiserats
  • Fysiska institutionen

Publiceringsår

1996

Språk

Engelska

Sidor

937-942

Publikation/Tidskrift/Serie

Astrophysical Journal

Volym

462

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

American Astronomical Society

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • abundances
  • individual (chi Lupi)
  • stars
  • peculiar

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0004-637X