Semi-regular and alternating pulsations in hydrodynamical models for low-mass giants

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, Giant Stars, Stellar Mass, Stellar Oscillations, Light Curve, Radiative Transfer, Stellar Envelopes, Stellar Luminosity, Stellar Magnetic Fields

Scientific paper

On the basis of hydrodynamical simulations the semiregular and alternating pulsations of the W Vir and RV Tau stars are studied including nonsteady radiative transfer effects in gray spherical-symmetric atmospheres. It is shown that the transition from regular to semiregular oscillations occurs at periods P greater than about 13-15 days due to pulsation energy imbalance provoked by strong radiating shocks. The differences between the periods and amplitudes of W Vir and RV Tau variables are explained as a result of this imbalance. It is suggested that the semiregular alternating pulsations of the RV Tau stars appear following a period-doubling phenomenon, which can be also understood in terms of the pulsation energy variations between odd and even fundamental cycles. On the basis of numerical results, a theoretical estimation of the upper limit for the luminosity of the RV Tau stars is derived as L less than about 1000 solar luminosities.

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