Excitation of Sr II lines in Eta Carinae

M. A. Bautista, T. R. Gull, K. Ishibashi, H. Hartman, K. Davidson

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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 ab initio 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 107 cm-3. Under these conditions, the observed emission can be explained without the need for a large Sr overabundance.

Original languageEnglish (US)
Pages (from-to)875-879
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume331
Issue number4
DOIs
StatePublished - Apr 21 2002

Keywords

  • Atomic data
  • Atomic processes
  • Line: formation
  • Stars: abundances
  • Stars: individual: Eta Carinae

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    Bautista, M. A., Gull, T. R., Ishibashi, K., Hartman, H., & Davidson, K. (2002). Excitation of Sr II lines in Eta Carinae. Monthly Notices of the Royal Astronomical Society, 331(4), 875-879. https://doi.org/10.1046/j.1365-8711.2002.05250.x