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In cooperation with other groups of researchers to obtain new observational data (light curves and spectra) for selected close binaries in the evolutionary stages close to formation of relativistic objects To specify evolutionary state of the group of close binary systems based on the analysis of their spectra, light curves and statistical properties To carry out calculations of the mass loss and angular momentum loss in binary systems on the evolution of orbit and to verify the differences in the evolutionary trends for close binaries and wide pairs To make theoretical estimates in order to clarify the nature of intrinsic variability in systems with common envelope and precataclysmic binaries. |