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FAST STELLAR PULSATIONS AND LOCAL MAGNETIC FIELDS
БЫСТРЫЕ ЗВЕЗДНЫЕ ПУЛЬСАЦИИ И ЛОКАЛЬНЫЕ МАГНИТНЫЕ ПОЛЯ

A.F. Kholtygin, St. Petersburg State University, St. Petersburg, Russia, A.V. Moiseeva, I.A. Yakunin, O.A. Tsiopa, A.F. Valeev, Special Astrophysical Observatory of the RAS, Nizhny Arkhyz, Russia, Special Astrophysical Observatory of the RAS, Nizhny Arkhyz, Russia, Main (Pulkovo) Astronomical Observatory RAS, St. Petersburg, Russia, Special Astrophysical Observatory of the RAS, Nizhny Arkhyz, Russia
2020 Proceedings of the 24th All-Russia Conference on Solar and Solar-Terrestrial Physics   unpublished

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The results of studies by of superfast (on minute and second scales) line profile variability in spectra of early-type star are reviewed. The spectra of program OBA stars were obtained with the 6-meter BTA telescope using a multi-mode SCORPIO reducer and using the MSS spectrograph with an exposure of 1-150 seconds and a total observation time of 2-3 hours. The variability of the line profiles is analyzed. Regular variations of the H, HeI, FeII, NII, OII, SiII line profiles were detected in
more » ... ra of program stars with periods from 2 to ~120 minutes and amplitudes of 1-2% of the continuum level. The frequencies of the line profile variations in the spectra of some stars with periods less than 10 minutes appeared to be variable. The frequencies of the short-period components can change by 20% during the observation period possibly and have a nature close to the nature of five-minute solar oscillations. We proposed a connection between irregular line profile variations with local magnetic fields and generated by them stellar micro-flares.
doi:10.31725/0552-5829-2020-317-320 fatcat:rdqjqkjabfcevffc4kdcwrnbyi
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A.F. Kholtygin, St. Petersburg State University, St. Petersburg, Russia, A.V. Moiseeva, I.A. Yakunin, O.A. Tsiopa, A.F. Valeev, Special Astrophysical Observatory of the RAS, Nizhny Arkhyz, Russia, Special Astrophysical Observatory of the RAS, Nizhny Arkhyz, Russia, Main (Pulkovo) Astronomical Observatory RAS, St. Petersburg, Russia, Special Astrophysical Observatory of the RAS, Nizhny Arkhyz, Russia. "FAST STELLAR PULSATIONS AND LOCAL MAGNETIC FIELDS." Proceedings of the 24th All-Russia Conference on Solar and Solar-Terrestrial Physics (2020)