Bondar N. The photometric and spectrophotometric research of nonstability stars with different age

The dissertation contains results of 19 scientific papers about nonstability stars on the different states of evolution. There are young eclipse binary system BM Ori, wich age are estimated of 105yr., active red dwarfs, wich age are 107-109 yr. and the late type objects - the symbiotic stars CH Cyg and PU Vul. On the long-term photometric observations there were detected a flare activity of BM Ori, researched the long- term activity on a surface of dKe-dMe stars and shown the relationships between activity level and their physical para- meters. Investigation of CH Cyg and PU Vul instability based on their pecular energy distributions. The both components in the CH Cyg system shown variations. Activity of PU Vul are produced by a flare of a hot dwarf , but a cool giant was stability.