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Lego Figure holding a lego telescope. Photo

Henrik Hartman

Researcher (Leave of Absence)

Lego Figure holding a lego telescope. Photo

Excitation of Sr II lines in Eta Carinae

Author

  • M A Bautista
  • T R Gull
  • K Ishibashi
  • Henrik Hartman
  • K Davidson

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.

Department/s

  • Lund Observatory - Undergoing reorganization

Publishing year

2002

Language

English

Pages

875-879

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

331

Issue

4

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • stars: individual: Eta Carinae
  • stars: abundances
  • line: formation
  • atomic data
  • atomic processes

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966