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Anomalously bright UV lines of Fe II as a probe of gas condensations in the vicinity of hot stars

Johansson, Sveneric LU and Letokhov, Vladilen LU (2003) In Astronomy & Astrophysics 412. p.771-776
Abstract
Two UV lines of Fe II at 2507/2509 Å are extremely bright inspatially resolved HST/STIS spectra of dense gas condensations (the socalled Weigelt blobs) close to the central star of eta Carinae. Thelines also appear unresolved in HST/FOS spectra of the star AE And.Under normal conditions the lines should hardly be observable. Based onrecent studies of the formation of thelambdalambda2507/2509 lines as part of a radiative cycledriven by HLyalpha pumping and including stimulated emission wepropose the possibility of using them as a probe of non-homogeneities ingas condensations located outside hot, massive stars.
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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
atomic processes, line: formation, radiation mechanisms: non-thermal, stars: individual: eta Car, AE And
in
Astronomy & Astrophysics
volume
412
pages
771 - 776
publisher
EDP Sciences
external identifiers
  • wos:000187075500018
  • scopus:0348156080
ISSN
0004-6361
DOI
10.1051/0004-6361:20031613
language
English
LU publication?
yes
id
ac723c93-9c3d-417f-9ba4-ef32fbac2c4d (old id 130441)
date added to LUP
2016-04-01 16:28:34
date last changed
2024-01-11 08:43:54
@article{ac723c93-9c3d-417f-9ba4-ef32fbac2c4d,
  abstract     = {{Two UV lines of Fe II at 2507/2509 Å are extremely bright inspatially resolved HST/STIS spectra of dense gas condensations (the socalled Weigelt blobs) close to the central star of eta Carinae. Thelines also appear unresolved in HST/FOS spectra of the star AE And.Under normal conditions the lines should hardly be observable. Based onrecent studies of the formation of thelambdalambda2507/2509 lines as part of a radiative cycledriven by HLyalpha pumping and including stimulated emission wepropose the possibility of using them as a probe of non-homogeneities ingas condensations located outside hot, massive stars.}},
  author       = {{Johansson, Sveneric and Letokhov, Vladilen}},
  issn         = {{0004-6361}},
  keywords     = {{atomic processes; line: formation; radiation mechanisms: non-thermal; stars: individual: eta Car; AE And}},
  language     = {{eng}},
  pages        = {{771--776}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy & Astrophysics}},
  title        = {{Anomalously bright UV lines of Fe II as a probe of gas condensations in the vicinity of hot stars}},
  url          = {{https://lup.lub.lu.se/search/files/4684232/624148.pdf}},
  doi          = {{10.1051/0004-6361:20031613}},
  volume       = {{412}},
  year         = {{2003}},
}