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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
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
2007-07-13 12:13:54
date last changed
2018-05-29 10:52:37
@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},
  keyword      = {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          = {http://dx.doi.org/10.1051/0004-6361:20031613},
  volume       = {412},
  year         = {2003},
}