Radial Stellar Pulsation and Three-Dimensional Convection. IV. Full Amplitude Three-Dimensional Solutions

Abstract

Three dimensional hydrodynamic simulations of full amplitude RR Lyrae stars have been computed for several models across the instability strip. The three dimensional nature of the calculations allows convection to be treated without reference to a phenomenological approach such as the local mixing length theory. Specifically, the time dependent interaction of the large scale eddies and the radial pulsation is controlled by the conservation laws, while the effects of smaller convective eddies are simulated by an eddy viscosity model. The light amplitudes for these calculations are quite similar to those of our previous two dimensional calculations in the middle of the instability strip, but somewhat lower near the red edge, the fundamental blue edge, and for the one first overtone model we computed. The time dependent interaction between the radial pulsation and the convective energy transport is essentially the same in three dimensions as it is in two dimensions. There are some differences between the light curves between the two and three dimensional simulations, particularly during decreasing light. Reasons for the differences, both numerical and physical are explored.

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Cited by in corpus (8)

• Survey of non-linear hydrodynamic models of type-II Cepheids
• HARPS-N high spectral resolution observations of Cepheids I. The Baade-Wesselink projection factor of δ Cep revisited
• Calibration of the convective parameters in stellar pulsation hydrocodes
• Finest light curve details, physical parameters, and period fluctuations of CoRoT RR Lyrae stars
• Temperature dependent convective parameters for RRc 1D-models
• Convective shells in the interior of Cepheid variable stars: overshooting models based on hydrodynamic simulations
• Connections between the cycle-to-cycle light curve and O-C variations of the non-Blazhko RR Lyrae stars
• A new framework of multidimensional pulsating stellar envelopes I.: Properties of turbulent convection in static RR Lyrae envelope models with SPHERLS