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Astrophysical laser operating in the OI 8446-angstrom line in the Weigelt blobs of eta Carinae

Johansson, Sveneric LU and Letokhov, Vladilen LU (2005) In Monthly Notices of the Royal Astronomical Society 364(2). p.731-737
Abstract
Within the framework of a simple model of photophysical processes in the Weigelt blobs in the vicinity of the luminous blue variable (LBV) star eta Carinae, we explain the presence of the fluorescent < O I > 8446-angstrom and forbidden [O I] 6300-angstrom lines as well as the absence of the allowed O I 7774-angstrom line in spectra recorded with the Hubble Space Telescope (HST)/STIS instrument (Gull et al.). From atomic data and estimated stellar parameters we demonstrate that there is a population inversion and stimulated emission in the 3p P-3-3s S-3 transition lambda 8446 due to photoexcitation by accidental resonance (PAR) by H Ly beta radiation.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stars : individual, radiation mechanisms : non-thermal, atomic processes, line : formation, eta Carinae, infrared : stars
in
Monthly Notices of the Royal Astronomical Society
volume
364
issue
2
pages
731 - 737
publisher
Wiley-Blackwell
external identifiers
  • wos:000233307700034
  • scopus:28744434155
ISSN
1365-2966
DOI
10.1111/j.1365-2966.2005.09605.x
language
English
LU publication?
yes
id
0d361554-c438-4fcc-aaad-0d6047ba5c32 (old id 212915)
date added to LUP
2007-08-03 11:14:03
date last changed
2017-01-01 04:26:44
@article{0d361554-c438-4fcc-aaad-0d6047ba5c32,
  abstract     = {Within the framework of a simple model of photophysical processes in the Weigelt blobs in the vicinity of the luminous blue variable (LBV) star eta Carinae, we explain the presence of the fluorescent &lt; O I &gt; 8446-angstrom and forbidden [O I] 6300-angstrom lines as well as the absence of the allowed O I 7774-angstrom line in spectra recorded with the Hubble Space Telescope (HST)/STIS instrument (Gull et al.). From atomic data and estimated stellar parameters we demonstrate that there is a population inversion and stimulated emission in the 3p P-3-3s S-3 transition lambda 8446 due to photoexcitation by accidental resonance (PAR) by H Ly beta radiation.},
  author       = {Johansson, Sveneric and Letokhov, Vladilen},
  issn         = {1365-2966},
  keyword      = {stars : individual,radiation mechanisms : non-thermal,atomic processes,line : formation,eta Carinae,infrared : stars},
  language     = {eng},
  number       = {2},
  pages        = {731--737},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Astrophysical laser operating in the OI 8446-angstrom line in the Weigelt blobs of eta Carinae},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2005.09605.x},
  volume       = {364},
  year         = {2005},
}