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Excitation of Sr II lines in Eta Carinae

Bautista, M A; Gull, T R; Ishibashi, K; Hartman, Henrik LU and Davidson, K (2002) In Monthly Notices of the Royal Astronomical Society 331(4). p.875-879
Abstract
We study the nature of the peculiar [Sr II] and Sr II emission filament found in the ejecta of Eta Carinae. To this purpose we carry out abinitio calculations of radiative transition probabilities and electron impact excitation rate coefficients for Sr II. Then we build a multilevel model for the system which is used to investigate the physical condition of the filament and the nature of the observed allowed and forbidden Sr II optical emission. It is found that the observed spectrum is consistent with the lines being pumped by the continuum radiation field in a mostly neutral region with electron density near 10<SUP>7</SUP>cm<SUP>-3</SUP> . Under these conditions, the observed emission can be explained without the... (More)
We study the nature of the peculiar [Sr II] and Sr II emission filament found in the ejecta of Eta Carinae. To this purpose we carry out abinitio calculations of radiative transition probabilities and electron impact excitation rate coefficients for Sr II. Then we build a multilevel model for the system which is used to investigate the physical condition of the filament and the nature of the observed allowed and forbidden Sr II optical emission. It is found that the observed spectrum is consistent with the lines being pumped by the continuum radiation field in a mostly neutral region with electron density near 10<SUP>7</SUP>cm<SUP>-3</SUP> . Under these conditions, the observed emission can be explained without the need for a large Sr overabundance. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stars: individual: Eta Carinae, stars: abundances, line: formation, atomic data, atomic processes
in
Monthly Notices of the Royal Astronomical Society
volume
331
issue
4
pages
875 - 879
publisher
Wiley-Blackwell
external identifiers
  • wos:000175270700009
  • scopus:0042641622
ISSN
1365-2966
DOI
10.1046/j.1365-8711.2002.05250.x
language
English
LU publication?
yes
id
611975a1-773e-44c5-9ec6-a24c514d2384 (old id 130366)
date added to LUP
2007-07-12 13:42:38
date last changed
2017-01-15 03:24:25
@article{611975a1-773e-44c5-9ec6-a24c514d2384,
  abstract     = {We study the nature of the peculiar [Sr II] and Sr II emission filament found in the ejecta of Eta Carinae. To this purpose we carry out abinitio calculations of radiative transition probabilities and electron impact excitation rate coefficients for Sr II. Then we build a multilevel model for the system which is used to investigate the physical condition of the filament and the nature of the observed allowed and forbidden Sr II optical emission. It is found that the observed spectrum is consistent with the lines being pumped by the continuum radiation field in a mostly neutral region with electron density near 10&lt;SUP&gt;7&lt;/SUP&gt;cm&lt;SUP&gt;-3&lt;/SUP&gt; . Under these conditions, the observed emission can be explained without the need for a large Sr overabundance.},
  author       = {Bautista, M A and Gull, T R and Ishibashi, K and Hartman, Henrik and Davidson, K},
  issn         = {1365-2966},
  keyword      = {stars: individual: Eta Carinae,stars: abundances,line: formation,atomic data,atomic processes},
  language     = {eng},
  number       = {4},
  pages        = {875--879},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Excitation of Sr II lines in Eta Carinae},
  url          = {http://dx.doi.org/10.1046/j.1365-8711.2002.05250.x},
  volume       = {331},
  year         = {2002},
}