Spherization of remnants of the asymmetrical supernova explosi on in the uniform medium

The spherization of a shock wave is considered, which propagates in the uniform interstellar medium in the presence of the initial asymmetry of the shape and velocity. The calculations have been made in the approximation of 1.5 dimensional hydrodynamics. Three different models have been considered in preference to the ''show-plough'' model. The characteristic time of the spherization is found for different values of the density of the medium and parameters of the explosion It is obtained that to the moment of the spherization in the shape of the shock large dif erence of the surface density on the pole and equator remains when the initial asymmetry is large. It may explain the observational features of the Cas A supernova remnant