Close binary stars. In 2 parts. Part 1

Thanks to the successes of X-ray astronomy, the problem of close double stars has become one of the central in astrophysics. The monograph presents modern methods and results of studies of close double stars and information about their fundamental characteristics - masses, radius and temperatures. It makes close double stars with a powerful tool for the study of physics and evolution of stars, as well as to open and study fundamentally new objects of the Universe - neutron stars and black holes.
The monograph may be useful to students and graduate students, professors and university teachers, as well as scientists who are interested in the problems of stars and relativistic astrophysics