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Asteroseismology with the new opacity bump at log T ≈ 5.06

Published online by Cambridge University Press:  18 February 2014

H. Cugier
H. Cugier*
Affiliation:
Astronomical Institute of the Wroclaw University, 51-622 Wroclaw, Poland, email: cugier@astro.uni.wroc.pl
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Abstract

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Although the κ mechanism of pulsations is known for early-type stars, opacities and the equation of state are still uncertain. Stellar models calculated for the OP data implemented with the new Kurucz opacities at log T < 5.2 were investigated for different chemical compositions of elements. The additional metallic opacity bump at log T ≈ 5.06 that occurs in the Kurucz data changes markedly the oscillation spectra of unstable modes. Basic properties of the new opacity bump and examples of seismic models are shown. B-type stars observed in the Galaxy, LMC and SMC were considered. The problem was studied using Dziembowski's computing codes for linear, non-adiabatic and non-radial oscillations.

Keywords

starsstellar evolutionasteroseismologyradiative opacity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 401 - 402
Copyright
Copyright © International Astronomical Union 2014 

References

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