Advanced

Constraining the very heavy elemental abundance peak in the chemically peculiar star χ Lupi, with new atomic data for Os II and Ir II

Ivarsson, Stefan LU ; Wahlgren, Glenn LU ; Dai, Zhenwen LU ; Lundberg, Hans LU and Leckrone, D S (2004) In Astronomy & Astrophysics 425(1). p.353-360
Abstract
The determination of elemental abundances plays an important role inunderstanding the atmospheric processes that lead to anomalies inspectra of chemically peculiar stars. Ongoing study of the HgMn star χ Lupi has defined much of the elemental abundance distribution but progress is dependent upon the availability and accuracy of the atomic data. Here we present experimentally determined wavelengths and oscillator strengths for 27 Os II and 23 Ir II transitions. The oscillator strengths have been determined by combining radiative lifetimes measured using the laser-induced fluorescence technique withbranching fractions determined from Fourier transform spectrometeremission line intensities. The new data were used in a synthetic spectrum... (More)
The determination of elemental abundances plays an important role inunderstanding the atmospheric processes that lead to anomalies inspectra of chemically peculiar stars. Ongoing study of the HgMn star χ Lupi has defined much of the elemental abundance distribution but progress is dependent upon the availability and accuracy of the atomic data. Here we present experimentally determined wavelengths and oscillator strengths for 27 Os II and 23 Ir II transitions. The oscillator strengths have been determined by combining radiative lifetimes measured using the laser-induced fluorescence technique withbranching fractions determined from Fourier transform spectrometeremission line intensities. The new data were used in a synthetic spectrum analysis of high-resolution ultraviolet spectra of χ Lupi obtained with the Hubble Space Telescope. Weak abundance enhancement swere determined for both elements, [Os/H] = +1.3 dex and [Ir/H] = +0.7dex, which now clearly defines the heavy element abundance peak in this star to be comprised of only the four elements Pt, Au, Hg, and Tl. This result offers a new constraint on theoretical efforts to explain the observed spectrum anomalies. Based in part on observations obtained with the GHRS instrument on board the Hubble Space Telescope. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stars: chemically peculiar, atomic data, stars: abundances, stars: individual: χ Lupi
in
Astronomy & Astrophysics
volume
425
issue
1
pages
353 - 360
publisher
EDP Sciences
external identifiers
  • wos:000224734400040
  • scopus:4744350832
ISSN
0004-6361
DOI
10.1051/0004-6361:20040298
language
English
LU publication?
yes
id
f2e0823a-84f1-4ece-a77b-9d4b14a2429b (old id 134089)
date added to LUP
2007-07-13 11:00:26
date last changed
2017-01-01 06:46:48
@article{f2e0823a-84f1-4ece-a77b-9d4b14a2429b,
  abstract     = {The determination of elemental abundances plays an important role inunderstanding the atmospheric processes that lead to anomalies inspectra of chemically peculiar stars. Ongoing study of the HgMn star χ Lupi has defined much of the elemental abundance distribution but progress is dependent upon the availability and accuracy of the atomic data. Here we present experimentally determined wavelengths and oscillator strengths for 27 Os II and 23 Ir II transitions. The oscillator strengths have been determined by combining radiative lifetimes measured using the laser-induced fluorescence technique withbranching fractions determined from Fourier transform spectrometeremission line intensities. The new data were used in a synthetic spectrum analysis of high-resolution ultraviolet spectra of χ Lupi obtained with the Hubble Space Telescope. Weak abundance enhancement swere determined for both elements, [Os/H] = +1.3 dex and [Ir/H] = +0.7dex, which now clearly defines the heavy element abundance peak in this star to be comprised of only the four elements Pt, Au, Hg, and Tl. This result offers a new constraint on theoretical efforts to explain the observed spectrum anomalies. Based in part on observations obtained with the GHRS instrument on board the Hubble Space Telescope.},
  author       = {Ivarsson, Stefan and Wahlgren, Glenn and Dai, Zhenwen and Lundberg, Hans and Leckrone, D S},
  issn         = {0004-6361},
  keyword      = {stars: chemically peculiar,atomic data,stars: abundances,stars: individual: χ Lupi},
  language     = {eng},
  number       = {1},
  pages        = {353--360},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {Constraining the very heavy elemental abundance peak in the chemically peculiar star χ Lupi, with new atomic data for Os II and Ir II},
  url          = {http://dx.doi.org/10.1051/0004-6361:20040298},
  volume       = {425},
  year         = {2004},
}