Systematic study of compact stellar remnants in close binary systems (CBS) shows that there is a considerable gap between masses of neutron stars (NS) and black hole (BH) candidates. This means that the observable spectrum of NSs and BH candidates shows an obvious lack of compact objects with masses within the interval 2 - 6 solar's. The long-term study revealed another observational property of BH candidates themselves: It turned out that, similarly to NSs, they have a distinguished mass value. In 16 CBSs with low-mass (~0.6 solar mass) optical companions and most precisely measured parameters the most probable value (a peak in distribution of mass of relativistic objects) is close to 6.7 masses of the Sun. Thus, now one can say about a discrete spectrum of the compact stellar remnant masses with a sharp gap between 2 and 6 masses of the Sun, which inevitably make a problem in explanation of Core-Collapse Supernovae explosion related to gamma-ray bursts. In particular, one can try to explain the polarized emission of gamma-ray bursts, the black-body component in their spectra and other observational properties as a direct manifestation of collapsar surface...

Russian abstract

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