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The "Scenario Machine" (a computer code designed for studies of the evolutionof close binaries) was used to carry out a population synthesis for a widerange of merging astrophysical objects: main-sequence stars with main-sequencestars; white dwarfs with white dwarfs, neutron stars, and black holes; neutronstars with neutron stars and black holes; and black holes with black holes.Wecalculate the rates of such events, and plot the mass distributions for mergingwhite dwarfs and main-sequence stars. It is shown that Type Ia supernovae canbe used as standard candles only after approximately one billion years ofevolution of galaxies. In the course of this evolution, the average energy ofType Ia supernovae should decrease by roughly 10%; the maximum and minimumenergies of Type Ia supernovae may differ by no less than by a factor of 1.5.This circumstance should be taken into account in estimations of parameters ofacceleration of the Universe. According to theoretical estimates, the mostmassive - as a rule, magnetic - white dwarfs probably originate from mergers ofwhite dwarfs of lower mass. At least some magnetic Ap and Bp stars may form inmergers of low-mass main sequence stars (<1.5 mass of the Sun) with convectiveenvelopes.

Merging of Components in Close Binaries: Type Ia Supernovae, Massive White Dwarfs, and Ap stars