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Analysis of strange-mode instability with time-dependent convection in hot massive stars

Published online by Cambridge University Press:  18 February 2014

Takafumi Sonoi  and
Hiromoto Shibahashi
Takafumi Sonoi
Affiliation:
Department of Astronomy, University of Tokyo, Tokyo, 113-0033, Japan email: sonoi@astron.s.u-tokyo.ac.jp, shibahashi@astron.s.u-tokyo.ac.jp
Hiromoto Shibahashi
Affiliation:
Department of Astronomy, University of Tokyo, Tokyo, 113-0033, Japan email: sonoi@astron.s.u-tokyo.ac.jp, shibahashi@astron.s.u-tokyo.ac.jp
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Abstract

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We carry out nonadiabatic analysis of strange-modes in hot massive stars with time-dependent convection (TDC) for the first time. Although convective luminosity in envelopes of hot massive stars is not as dominative as in stars near the red edge of the classical Cepheid instability strip in the Hertzsprung-Russell (H-R) diagram, we have found that the strange-mode instability can be affected by the treatment of convection. However, existence of the instability around and over the Humphreys-Davidson (H-D) limit is independent of the treatment. This implies that the strange-mode instability could be responsible for the lack of observed stars over the H-D limit regardless of uncertainties on convection theories.

Keywords

stars: Hertzsprung-Russell diagramstars: oscillations (including pulsations)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 493 - 494
Copyright
Copyright © International Astronomical Union 2014 

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