Excitation of Sr II lines in Eta Carinae
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/130366
- author
- Bautista, M A ; Gull, T R ; Ishibashi, K ; Hartman, Henrik LU and Davidson, K
- organization
- publishing date
- 2002
- 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
- Oxford University Press
- 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
- 2016-04-01 11:33:35
- date last changed
- 2024-04-22 08:00:04
@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<SUP>7</SUP>cm<SUP>-3</SUP> . 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}}, keywords = {{stars: individual: Eta Carinae; stars: abundances; line: formation; atomic data; atomic processes}}, language = {{eng}}, number = {{4}}, pages = {{875--879}}, publisher = {{Oxford University Press}}, series = {{Monthly Notices of the Royal Astronomical Society}}, title = {{Excitation of Sr II lines in Eta Carinae}}, url = {{https://lup.lub.lu.se/search/files/2543010/624140.pdf}}, doi = {{10.1046/j.1365-8711.2002.05250.x}}, volume = {{331}}, year = {{2002}}, }