Butkovs'ka V. Physical properties of the hot pulsating star gamma Pegasi

The thesis was carried out in the field of one of the major problem of physics of stars - magnetism of hot pulsating stars. The high-accuracy measurement of the weak stellar magnetic fields is a difficult task and systematic study of the weak magnetic fields is possible only using a few telescopes in the world, including the 2.6m reflector named after acad. G.A.Shajn of the SRI "CrAO". Before this work a question about variability of magnetic field with the period of pulsations for hot pulsating stars remained unstudied. But without reliable detection of the fact of the variability of the magnetic field with the pulsation period, and possible reasons of this variability, the detailed magnitohydrodynamical modelling of physical proc-esses in the atmospheres of variable stars is impossible. The unique spectroscopic and spectropolarimetric data were obtained. For the first time the magnetic field is detected on the hot pulsating star gamma Pegasi. The measured values of the magnetic field are the most accurate magnetic field measurements for hot pulsating stars in the world. For the first time in the world the longitudinal component of the magnetic field was found to be variable during the pulsation period of a star. The pulsation curve of longitudinal magnetic field of gamma Pegasi is the most accurate among all known curves of stellar magnetic field variation with the exception of the Sun. The obtained results are used in the SRI "CrAO", and also they can be used in others research groups in the world, who study of physics of hot stars, and by the teachers of universities for preparation of lectures. The radial velocities of Peg is published in the world professional electronic database CDS for open access. The obtained results are important for further magnitohydrodynamical modeling of physical processes in the atmospheres of variable stars.