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- Title
Superfast Stellar Pulsations of Hot Stars.
- Authors
Kholtygin, A. F.; Moiseeva, A. V.; Yakunin, I. A.; Tsiopa, O. A.; Ikonnikova, N. P.; Burlak, M. A.; Valeev, A. F.
- Abstract
The results of studies of superfast line profile variability in spectra of early-type star on minute and second time scales are reviewed. The spectra of bright OBA stars were obtained with the 6-meter BTA telescope of the Special Astrophysical Observatory (SAO, Russia). Additionally selected OBA stars were observed with the 1-m telescope of SAO and with the 1.25-m telescope of the Crimean Astronomical Station of SAI, Russia. The variations of the line profiles are analyzed. Regular line profiles variations (LPVs) of the H, HeI, FeII, NII, OII, and SiII in spectra of program stars with periods from 10 to ~120 minutes and amplitudes of 1–2% of the continuum level were detected. The short-time transient quasi-regular LPVs with periods from 1 to 10 minutes and lifetime in the interval 20–100 minutes were also registered. The periods of such transients appeared to be variable. Their frequencies can change up to 20% during their lifetime. A nature of such transients is unknown and a similarity of their generation to that for the five-minute solar oscillations is an open question. A connection between irregular LPVs and local magnetic fields generating the stellar micro-flares is proposed.
- Subjects
RUSSIA; STELLAR oscillations; EARLY stars; STELLAR magnetic fields; SOLAR oscillations; STELLAR spectra
- Publication
Geomagnetism & Aeronomy, 2021, Vol 61, Issue 7, p923
- ISSN
0016-7932
- Publication type
Article
- DOI
10.1134/S0016793221070100