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Multimode Radiative beta Cephei and delta Cephei Models

Published online by Cambridge University Press:  15 August 2009

M. Goupil ,
Z. Kolláth ,
N. Nardetto ,
P. Kervella  and
R. Smolec
R. Smolec*
Affiliation:
Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
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Abstract

As a by-product of β Cephei and δ Cephei radiative model surveys we have found interesting cases of multimode pulsation. In case of β Cephei stars, we found two multimode domains with two or three modes being involved. The origin of the multimode pulsation can be traced to one of the two different mechanisms: either to the non-resonant coupling of the two excited modes (double-mode pulsation) or to the 2ω1$\simeq$ω0 + ω2 parametric resonance (triple-mode pulsation). In case of δ Cephei models, a triple-mode pulsation domain, connected with the 2:1 resonance, 2ω0$\simeq$ω2, is found. These models are of theoretical interest only, since they do not obey a proper mass-luminosity relation.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 38: Nonlinear Pulsations and Hydrodynamics of Cepheids , 2009 , pp. 175 - 183
Copyright
© EAS, EDP Sciences, 2009

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