Multimode Radiative beta Cephei and delta Cephei Models

R. Smolec

doi:10.1051/eas/0938019

All issues

Volume 38 (2009)

EAS Publications Series, 38 (2009) 175-183

Abstract

Issue		EAS Publications Series Volume 38, 2009 Nonlinear Pulsations and Hydrodynamics of Cepheids


Page(s)		175 - 183
DOI		https://doi.org/10.1051/eas/0938019
Published online		15 August 2009

Nonlinear Pulsations and Hydrodynamics of Cepheids
M. Goupil, Z. Kolláth, N. Nardetto and P. Kervella (eds)
EAS Publications Series, 38 (2009) 175-183

Multimode Radiative beta Cephei and delta Cephei Models

R. Smolec

Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland

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.