ON EVOLUTION OF CONTACT ECLIPSING BINARIES

It is shown that during contact eclipsing binaries evolution under the influence of stellar wind, magnetic stellar wind and with matter tran sfer by gas flow, in binary stellar systems there may take place a pro cess of star merger (low mass stars) within 10(5) - 10(7) yr and a fas t increase of distance between stars of massive binaries. W UMa-type s tars are a finite evolutionary stage of very close and low mass binary pairs. As for contact systems of early spectral types (CE-systems), t hey are more varied in evolution.