izvcrao Изв. Крымск. Астрофиз. Обсерв. Izv. Krymsk. Astrofiz. Observ. Известия Крымской астрофизической обсерватории Izvestiya Krymskoi Astrofizicheskoi Observatorii 0367-8466 3034-4107 Киселев Н.Н., пос. Московский, Москва, РФ RU 243 Материалы конференции Сonference proceedings High-accuracy spectropolarimetric study of γ Pegasi in the line He I 6678 Å Butkovskaya V. Khan S. Plachinda S. Rostopchin S. Shulyak D. Crimean Astrophysical Observatory Crimean Astrophysical Observatory Physics and Astronomy Department, University of Western Ontario, London, ON, N6A 3K7, Canada; Institute for Astronomy, University of Vienna, Turkenschanzstrasse 17, Vienna, Austria, 1180 Crimean Astrophysical Observatory Crimean Astrophysical Observatory Crimean Astrophysical Observatory Crimean Astrophysical Observatory Tavrian National University, Yaltinskaya 4, Simferopol, Crimea, Ukraine, 95007; Institute for Astronomy, University of Vienna, Turkenschanzstrasse 17, Vienna, Austria, 1180 01 07 2007 103 3 110 115 27 09 2017 Copyright (c) 2007 , , , , Copyright (c) 2007 Butkovskaya V., Khan S., Plachinda S., Rostopchin S., Shulyak D. 2007 , , , , Butkovskaya V., Khan S., Plachinda S., Rostopchin S., Shulyak D. Метаданные этой статьи доступны по лицензии Creative Commons «Attribution» («Атрибуция») 4.0 Всемирная. Авторское право и право на публикацию текстов, представленных в журнале  "Известия Крымской астрофизической обсерватории", сохраняются за авторами, при этом право первой публикации предоставляется журналу. Тексты могут свободно использоваться при условии правильного цитирования с указанием авторства в соответствии с лицензией Creative Commons «Attribution» («Атрибуция») 4.0 Всемирная. The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Izvestiya Krymskoi Astrofizicheskoi Observatorii is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

Results of an intensive spectropolarimetric study of the small-amplitude purely radial pulsating β Cephei-type star γ  Pegasi are presented. It was found that residual intensity, full width at half maximum and equivalent width of the helium line vary during 0.15-day pulsation period and reach its maximal value when the temperature of the star is highest. The line parameter variations due to pulsation were explained as a temperature effect. It was shown, that if the star has a dipole magnetic field then dipole axis would be situated near rotation equator plane. It was estimated, that owing to frizzing of magnetic field into plasma amplitude of the longitudinal magnetic field variation due to radial pulsation of the star is 0.4 Gauss. Studying of a possible origin of 6.83-day period of γ -velocity variation has been made. It was concluded, that the star is a spectroscopic binary and improved orbital elements are presented. The orbit inclination angle was estimated as i ≤ 7°.