A simple convection model for selfgravitating fluid dynamics. Time-dependent convective energy transfer in protostars and nonlinear stellar pulsations

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Convection, Hydrodynamics, Stars: Formation, Stars: Oscillations

Scientific paper

We describe a relatively simple time-dependent convection model that can be coupled to the equations of radiation hydrodynamics. We show that it behaves in a physically plausible way in protostellar collapse flows and is quantitatively correct for nonlinear RR-Lyrae pulsations and the Sun. Together with the equations of radiation hydrodynamics the model closely approximates the classical stellar structure equations with mixing length convection for a set of standard assumptions.

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