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The O IV and S IV intercombination lines in the ultraviolet spectra of astrophysical sources

Keenan, FP; Ahmed, S; Brage, Tomas LU ; Doyle, JG; Espey, BR; Exter, KM; Hibbert, A; Keenan, MTC; Madjarska, MS and Mathioudakis, M, et al. (2002) In Monthly Notices of the Royal Astronomical Society 337(3). p.901-909
Abstract
New electron density diagnostic line ratios are presented for the O IV 2s(2)2p P-2-2s2p(24)P and S IV 3s(2)3p P-2-3s3p(24)P intercombination lines around 1400 Angstrom comparison of these with observational data for the symbiotic star RR Telescopii (RR Tel), obtained with the Space Telescope Imaging Spectrograph (STIS), reveals generally very good agreement between theory and observation. However the S IV P-2(3/2)-P-4(1/2) transition at 1423.824 Angstrom is found to be blended with an unknown feature at 1423.774 Angstrom. The linewidth for the latter indicates that the feature arises from a species with a large ionization potential. In addition, the S IV P-2(1/2)-P-4(3/2) transition at 1398.044 Angstrom is identified for the first time (to... (More)
New electron density diagnostic line ratios are presented for the O IV 2s(2)2p P-2-2s2p(24)P and S IV 3s(2)3p P-2-3s3p(24)P intercombination lines around 1400 Angstrom comparison of these with observational data for the symbiotic star RR Telescopii (RR Tel), obtained with the Space Telescope Imaging Spectrograph (STIS), reveals generally very good agreement between theory and observation. However the S IV P-2(3/2)-P-4(1/2) transition at 1423.824 Angstrom is found to be blended with an unknown feature at 1423.774 Angstrom. The linewidth for the latter indicates that the feature arises from a species with a large ionization potential. In addition, the S IV P-2(1/2)-P-4(3/2) transition at 1398.044 Angstrom is identified for the first time (to our knowledge) in an astrophysical source other than the Sun, and an improved wavelength of 1397.166 Angstrom is measured for the O IV P-2(1/2)-P-4(3/2) line. The O IV and S IV line ratios in a sunspot plume spectrum, obtained with the Solar Ultraviolet Measurements of the Emitted Radiation (SUMER) instrument on the Solar and Heliospheric Observatory, are found to be consistent, and remove discrepancies noted in previous comparisons of these two ions. (Less)
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publication status
published
subject
keywords
binaries : symbiotic, atomic data, Sun : UV radiation
in
Monthly Notices of the Royal Astronomical Society
volume
337
issue
3
pages
901 - 909
publisher
Wiley-Blackwell
external identifiers
  • wos:000179648100018
  • scopus:19044398824
ISSN
1365-2966
DOI
10.1046/j.1365-8711.2002.05988.x
language
English
LU publication?
yes
id
4f577be0-0ff7-4b99-80cb-3b480f9e6c8f (old id 321575)
date added to LUP
2007-10-31 09:02:57
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2017-07-09 03:44:23
@article{4f577be0-0ff7-4b99-80cb-3b480f9e6c8f,
  abstract     = {New electron density diagnostic line ratios are presented for the O IV 2s(2)2p P-2-2s2p(24)P and S IV 3s(2)3p P-2-3s3p(24)P intercombination lines around 1400 Angstrom comparison of these with observational data for the symbiotic star RR Telescopii (RR Tel), obtained with the Space Telescope Imaging Spectrograph (STIS), reveals generally very good agreement between theory and observation. However the S IV P-2(3/2)-P-4(1/2) transition at 1423.824 Angstrom is found to be blended with an unknown feature at 1423.774 Angstrom. The linewidth for the latter indicates that the feature arises from a species with a large ionization potential. In addition, the S IV P-2(1/2)-P-4(3/2) transition at 1398.044 Angstrom is identified for the first time (to our knowledge) in an astrophysical source other than the Sun, and an improved wavelength of 1397.166 Angstrom is measured for the O IV P-2(1/2)-P-4(3/2) line. The O IV and S IV line ratios in a sunspot plume spectrum, obtained with the Solar Ultraviolet Measurements of the Emitted Radiation (SUMER) instrument on the Solar and Heliospheric Observatory, are found to be consistent, and remove discrepancies noted in previous comparisons of these two ions.},
  author       = {Keenan, FP and Ahmed, S and Brage, Tomas and Doyle, JG and Espey, BR and Exter, KM and Hibbert, A and Keenan, MTC and Madjarska, MS and Mathioudakis, M and Pollacco, DL},
  issn         = {1365-2966},
  keyword      = {binaries : symbiotic,atomic data,Sun : UV radiation},
  language     = {eng},
  number       = {3},
  pages        = {901--909},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {The O IV and S IV intercombination lines in the ultraviolet spectra of astrophysical sources},
  url          = {http://dx.doi.org/10.1046/j.1365-8711.2002.05988.x},
  volume       = {337},
  year         = {2002},
}