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Time variations of the narrow Fe II and H I spectral emission lines from the close vicinity of Eta Carinae during the spectral event of 2003

Hartman, Henrik LU ; Damineli, A; Johansson, Sveneric LU and Letokhov, Vladilen LU (2005) In Astronomy & Astrophysics 436(3). p.945-952
Abstract
The spectrum of Eta Carinae and its ejecta shows slow variations over a period of 5.5 years. However, the spectrum changes drastically on a time scale of days once every period called the "spectral event". We report on variations in the narrow emission line spectrum of gas condensations (the Weigelt blobs) close to the central star during a spectral event. The rapid changes in the stellar radiation field illuminating the blobs make the blobs a natural astrophysical laboratory to study atomic photoprocesses. The different responses of the HI Paschen lines, fluorescent < Fe II > lines and forbidden [Fe II] lines allow us to identify the processes and estimate physical conditions in the blobs. This paper is based on observations from... (More)
The spectrum of Eta Carinae and its ejecta shows slow variations over a period of 5.5 years. However, the spectrum changes drastically on a time scale of days once every period called the "spectral event". We report on variations in the narrow emission line spectrum of gas condensations (the Weigelt blobs) close to the central star during a spectral event. The rapid changes in the stellar radiation field illuminating the blobs make the blobs a natural astrophysical laboratory to study atomic photoprocesses. The different responses of the HI Paschen lines, fluorescent < Fe II > lines and forbidden [Fe II] lines allow us to identify the processes and estimate physical conditions in the blobs. This paper is based on observations from the Pico dos Dias Observatory (LNA/Brazil) during the previous event in June 2003. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
regions, stars : individual : Eta Carinae, radiation mechanisms : non-thermal, ISM : HII, atomic processes
in
Astronomy & Astrophysics
volume
436
issue
3
pages
945 - 952
publisher
EDP Sciences
external identifiers
  • wos:000229667300019
  • scopus:21244490041
ISSN
0004-6361
DOI
10.1051/0004-6361:20052835
language
English
LU publication?
yes
id
91656702-b7ea-4d4c-99e6-92f32258c922 (old id 237598)
date added to LUP
2007-09-28 08:35:06
date last changed
2017-01-01 07:22:27
@article{91656702-b7ea-4d4c-99e6-92f32258c922,
  abstract     = {The spectrum of Eta Carinae and its ejecta shows slow variations over a period of 5.5 years. However, the spectrum changes drastically on a time scale of days once every period called the "spectral event". We report on variations in the narrow emission line spectrum of gas condensations (the Weigelt blobs) close to the central star during a spectral event. The rapid changes in the stellar radiation field illuminating the blobs make the blobs a natural astrophysical laboratory to study atomic photoprocesses. The different responses of the HI Paschen lines, fluorescent &lt; Fe II &gt; lines and forbidden [Fe II] lines allow us to identify the processes and estimate physical conditions in the blobs. This paper is based on observations from the Pico dos Dias Observatory (LNA/Brazil) during the previous event in June 2003.},
  author       = {Hartman, Henrik and Damineli, A and Johansson, Sveneric and Letokhov, Vladilen},
  issn         = {0004-6361},
  keyword      = {regions,stars : individual : Eta Carinae,radiation mechanisms : non-thermal,ISM : HII,atomic processes},
  language     = {eng},
  number       = {3},
  pages        = {945--952},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {Time variations of the narrow Fe II and H I spectral emission lines from the close vicinity of Eta Carinae during the spectral event of 2003},
  url          = {http://dx.doi.org/10.1051/0004-6361:20052835},
  volume       = {436},
  year         = {2005},
}