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Title:
Excitation of g modes in Wolf-Rayet stars by a deep opacity bump
Authors:
Townsend, R. H. D.; MacDonald, J.
Affiliation:
AA(Department of Physics & Astronomy, University of Delaware, Newark, DE 19716, USA; Bartol Research Institute, University of Delaware, Newark, DE 19716, USA), AB(Department of Physics & Astronomy, University of Delaware, Newark, DE 19716, USA)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 368, Issue 1, pp. L57-L61. (MNRAS Homepage)
Publication Date:
05/2006
Origin:
MNRAS
MNRAS Keywords:
stars: individual: HD 177230 (WR 123), stars: oscillations, stars: variables: other, stars: winds, outflows, stars: Wolf-Rayet
DOI:
10.1111/j.1745-3933.2006.00157.x
Bibliographic Code:
2006MNRAS.368L..57T

Abstract

We examine the stability of l= 1 and l= 2 g modes in a pair of nitrogen-rich Wolf-Rayet stellar models characterized by differing hydrogen abundances. We find that modes with intermediate radial orders are destabilized by a κ mechanism operating on an opacity bump at an envelope temperature of logT~ 6.25. This `deep opacity bump' is due primarily to L-shell bound-free transitions of iron. Periods of the unstable modes span ~11-21h in the model containing some hydrogen, and ~3-12h in the hydrogen-depleted model. Based on the latter finding, we suggest that self-excited g modes may be the source of the 9.8-h periodic variation of WR 123 recently reported by Lefèvre et al.

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