Excitation of Sr II lines in Eta Carinae
Författare
Summary, in English
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.
Avdelning/ar
Publiceringsår
2002
Språk
Engelska
Sidor
875-879
Publikation/Tidskrift/Serie
Monthly Notices of the Royal Astronomical Society
Volym
331
Issue
4
Fulltext
- Available as PDF - 168 kB
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Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Oxford University Press
Ämne
- Astronomy, Astrophysics and Cosmology
Nyckelord
- stars: individual: Eta Carinae
- stars: abundances
- line: formation
- atomic data
- atomic processes
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1365-2966