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Super slow rotators as a test of stellar magnetic field formation mechanisms
As a result of long-term observations at the 6-m BTA telescope, it was proved
that super slow magnetic rotators (stars with rotation periods of more than
several years and strong magnetic fields) are not an exception, as was
previously believed, but a natural phenomenon among magnetic Ap stars.
The presence of such objects proves that a magnetic field in Ap stars of
the Main Sequence can exist for a long time without any generation by the
dynamo mechanism. Thus, this mechanism is not a necessary condition for the
existence of a magnetic field. The result is important for the theory of the
formation of stellar magnetic fields, as it clearly shows that to explain their
existence in the stars of the upper part of the Main Sequence, the hypothesis
of the fossil origin of a field (from the magnetic field of the protostellar
nebula or generation in the early stages of evolution) is enough.
Authors:
Romanyuk I.I., Kudryavtsev D.O., Semenko E.A., Yakunin I.A. (SAO RAS)
Published:
I.I. Romanyuk, D.O. Kudryavtsev, E.A. Semenko, I.A. Yakunin, A.V. Moiseeva;
"Main Results of Magnetic Field Studies of CP Stars with the 6-m Telescope
over the Past 15 Years",
Ground-Based Astronomy in Russia. 21st Century, Proceedings of the
All-Russian Conference held 21-25 September, 2020 in Nizhny Arkhyz, Russia.
Edited by I.I. Romanyuk, I.A. Yakunin, A.F. Valeev, D.O. Kudryavtsev,
2020, p.56-63,
Detection of linear increase of radio emission from the microquasar
Cygnus X-3 during the giant flare in June 2019
During the studies of the flare of the microquasar Cygnus X-3, when for a
while it became the brightest stellar radio source in the Milky Way, in a
series of measurements on the multi-azimuth antenna system of the RATAN-600
radio telescope to track the object for five hours, we established for the
first time in the world that at the very beginning of the event (June 18, 2019),
the brightness of the radio source grew linearly and faster with time at higher
frequencies. This may be a decisive moment for determining the mechanism of
generation of relativistic electrons in jet emissions of the microquasar.
Authors:
Trushkin S.A., Bursov N.N., Shevchenko A.V., Tsybulev, P.G., Nizhelskij N.A.,
Kudriashova A.A., Borisov A.N., Bogod V.M., Storozhenko A.A. (SAO RAS)
Published:
1. S.A. Trushkin, N.A. Nizhelskij, P.G. Tsybulev, A.V. Shevchenko;
"Cygnus X-3 entered in the quenched radio and hard X-ray";
The Astronomer's Telegram, 2019, No. 12510,
http://www.astronomerstelegram.org/?read=12510
2. S.A. Trushkin, N.A. Nizhelskij, P.G. Tsybulev, N.N. Bursov,
A.V. Shevchenko;
"Evolution of multi-frequency emission from Cygnus X-3 in the current giant
flare"; The Astronomer's Telegram, 2019, No. 12701,
http://www.astronomerstelegram.org/?read=12701
3. S.A. Trushkin, N.A. Nizhelskij, P.G. Tsybulev, N.N. Bursov, A.V. Shevchenko,
A.A. Kudriashova, A.N. Borisov Gaint flares of the microquasar Cygnus X-3,
RAA, 2020, 4pp submitted
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