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Scientific achievements, Galaxy sector

Among stars nearby the Sun (distance up to 50pc) 30 new binary systems with a fast orbital rotation were found by means of interferometry with BTA. Components of the systems are low mass stars and white dwarfs. For 14 pairs orbit parameters were calculated and masses and luminosities of components were determined for the first time. It significantly simplifies fundamental empirical dependencies for low mass stars.

As a result of a multifrequency monitoring of the variability of a micro quasar Cyg X-3 (X-ray binary system which probably consists of a black hole and a high mass Wolf-Rayet star) a high activity period was registered for the first time in the last 4 years. This high activity period was manifested as a series of powerful radio bursts with an amplitude of 1 to 17 Jn and a transition into a high and soft X-ray state. For the first time the obtained data had allowed us to realize within a framework of a developed model that powerful mass ejections out of the central regions of a black hole are followed by relativistic shock waves in which fast and effective generation of relativistic electrons and magnetic fields takes place.

A study of statistical properties for a sample of 270 radio pulsars with known first and second derivatives of rotation frequency was carried out. For the first time significant correlations between the frequency and its derivatives had been found. The correlations give evidence of an irregularity of pulsar slowing down process at a scale of tens to hundreds years. Estimation of parameters for this phenomenon is made and its possible physical interpretations are given.

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