| Issue |
A&A
Volume 412, Number 3, December IV 2003
|
|
|---|---|---|
| Page(s) | 771 - 776 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20031613 | |
| Published online | 08 December 2003 | |
Anomalously bright UV lines of Fe II as a probe of gas condensations in the vicinity of hot stars
1
Lund Observatory, Lund University, PO Box 43, 22100 Lund, Sweden e-mail: Vladilen.Letokhov@astro.lu.se
2
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow region 142190, Russia
Corresponding author: S. Johansson, sveneric.johansson@astro.lu.se
Received:
26
May
2003
Accepted:
13
October
2003
Two UV lines of Fe II at 2507/2509 Å are extremely bright in
spatially resolved HST/STIS spectra of dense gas condensations (the so called
Weigelt blobs) close to the central star of η Carinae. The lines also
appear unresolved in HST/FOS spectra of the star AE And. Under normal
conditions the lines should hardly be observable.
Based on recent studies of the formation of the 
2507/2509 lines
as part of a radiative cycle driven by HLyα pumping and including
stimulated emission we propose the possibility of using them as a probe of
non-homogeneities in gas condensations located outside hot, massive stars.
Key words: atomic processes / line: formation / radiation mechanisms: non-thermal / stars: individual: η Car, AE And
© ESO, 2003
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