Research output: Contribution to journal › Article › peer-review
Superfast Stellar Pulsations of Hot Stars : Сверхбыстрые пульсации горячих звезд. / Kholtygin, A. F.; Yakunin, I. A.; Tsiopa, O. A.; Ikonnikova, N. P.; Burlak, M. A.; Valeev, A. F.
In: Geomagnetism and Aeronomy, Vol. 61, No. 7, 12.2021, p. 923-927.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Superfast Stellar Pulsations of Hot Stars
T2 - Сверхбыстрые пульсации горячих звезд
AU - Kholtygin, A. F.
AU - Yakunin, I. A.
AU - Tsiopa, O. A.
AU - Ikonnikova, N. P.
AU - Burlak, M. A.
AU - Valeev, A. F.
N1 - Publisher Copyright: © 2021, Pleiades Publishing, Ltd.
PY - 2021/12
Y1 - 2021/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85122056723&partnerID=8YFLogxK
U2 - 10.1134/S0016793221070100
DO - 10.1134/S0016793221070100
M3 - Article
AN - SCOPUS:85122056723
VL - 61
SP - 923
EP - 927
JO - Geomagnetism and Aeronomy
JF - Geomagnetism and Aeronomy
SN - 0016-7932
IS - 7
ER -
ID: 91281846