Convective self-oscillations in components of binary star systems

Computer Science

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Binary Stars, Convective Flow, Self Oscillation, Stellar Motions, Stellar Oscillations, Stellar Rotation, Boussinesq Approximation, Density Distribution, Equations Of Motion, Frequency Modulation, Gas Flow, Gravitational Effects, Incompressible Fluids, Kepler Laws, Stellar Gravitation, Tides

Scientific paper

A study is presented of convection in a star that is a component of a binary Keplerian system. The nonsynchronous character of axial rotation and orbital revolution of the star leads to periodic modulation of the gravity field of the star by tidal forces. It is shown that under certain conditions a self-oscillatory regime is possible, in which the mean intensity of oscillatory convective motions also varies periodically with time. The dependence of modulation frequency on convection intensity is the factor that determines the existence of the self-oscillations. The development of convection is accompanied by the redistribution of density and leads (due to conservation of momentum) to a change in the frequency of the rotation of the star about its axis, and hence to a change in the frequency of modulation of the gravity field by tidal forces.

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