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Title:
Influence of the Coriolis force on the instability of slowly pulsating B stars
Authors:
Townsend, R. H. D.
Affiliation:
AA(Bartol Research Institute, University of Delaware, Newark, DE 19716, USA; Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 360, Issue 2, pp. 465-476. (MNRAS Homepage)
Publication Date:
06/2005
Origin:
MNRAS
MNRAS Keywords:
methods: numerical, stars: early-type, stars: emission-line, Be, stars: oscillations, stars: rotation, stars: variables: other
DOI:
10.1111/j.1365-2966.2005.09002.x
Bibliographic Code:
2005MNRAS.360..465T

Abstract

This paper explores the effect of rotation on the κ-mechanism instability of slowly pulsating B stars. A new non-adiabatic code, which adopts the so-called traditional approximation to treat the Coriolis force, is used to investigate the influence exerted by rotation over the stability of stellar models covering the mass range 2.5Msolar<=M*<= 13.0Msolar. The principal finding is that, for all modes considered apart from the prograde sectoral (PS) class, rotation shifts the κ-mechanism instability toward higher luminosities and effective temperatures; these shifts are accompanied by broadenings in the extent of instability strips. Such behaviour is traced to the shortening of mode periods under the action of the Coriolis force. Instability strips associated with PS modes behave rather differently, being shifted to marginally lower luminosities and effective temperatures under the influence of rotation.

The implications of these results are discussed in the context of the observational scarcity of pulsation in B-type stars having significant rotation; various scenarios are explored to explain the apparent dichotomy between theory and observations. Furthermore, the possible significance of the findings to Be stars is briefly examined.

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