NONSTANDARD MIXING IN STARS

One of the most powerful tests of the stellar evolution theory is anal ysis of stars' atmospheric chemical composition. It has shown that som e non-standard mixing different from ordinary convection, semiconvecti on and convective overshooting seems to occur in stellar interiors. In the present study Zahn's rotationally induced turbulent diffusion is assumed to be responsible for such kind of mixing. We compare results of our evolutionary calculations with available observational data for massive main-sequence stars and red giants in globular clusters.