The mechanisms of changing the luminosity of various types of stars are considered. The problem of supercritical convection in an infinite plane layer is solved in the approximation of low velocities, the plane equation of which coincides with the equation for high velocities, a stationary solution is obtained. It is shown that there minimum two mechanisms of luminosity oscillations in stars: Supercritical convection in the upper layers of the star generates oscillatory changes in temperature and, accordingly, in the luminosity of the star, on the other hand, convection may have asymmetric periods. In the post-Newtonian approximation, the estimate of the frequency of changes in the luminosity of stars is corrected, and a general formula is obtained.
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