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Scientific achievements, Galaxy sector

Detection of rapid attenuation of magnetic characteristics of chemically peculiar stars in the Orion OB1 association with age
Resulting from observations of the young star association Orion OB1 carried out with the 6-m BTA telescope of SAO RAS, it was obtained that incidence of chemically peculiar stars relative to normal, incidence of magnetic stars relative to peculiar, and average magnetic field decrease two times with the average age increasing from 3 to 10 Myr. The relation given is obtained for the first time ever and can serve a new observation test to numerically check the concept on formation and evolution of magnetic CP stars.
Authors: Romanyuk I.I., Semenko E.A., Kudryavtsev D.O., Yakunin I.A., Moiseeva A.V.
Published:
1. Romanyuk I.I., Semenko E.A., Yakunin I.A., Kudryavtsev D.O., Moiseeva A.V., 2017, Astrophysical Bulletin, Vol.71, 183
2. Romanyuk I.I., Semenko E.A., Yakunin I.A., Kudryavtsev D.O., 2017, ASPC, v.510, 214
3. Romanyuk I.I., Semenko E.A., Yakunin I.A., Kudryavtsev D.O., Moiseeva A.V., 2017, Astronomische Nachrihten, 338, 8

Detection of fast variations of visual radiation of the binary millisecond pulsar J1023+0038
In February of 2017, photopolarimetric observations of the close binary system with the millisecond pulsar J1023+0038 (several years ago it developed from the ejection state into the accretion) were carried out with the 6-m BTA telescope of SAO RAS. Its numerous stochastic variations of brightness in the B, V, and U bands with the amplitude of 0.2^m - 0.5^m on the time scale of 10-100 s have been obtained during 3.5 hours. Outbursts up to 0.3 s with 0.1-s leading edges have been detected for the first time ever. The obtained results show that the system is at the "propeller" stage
Authors: Beskin G.M., Karpov S.V., Plokhotnichenko V.L., Sokolov V.V. in collaboration with Shibanov Yu.A., Zyuzin D.A. (Ioffe Institute), Kholtygin A. F., Baryishev Yu.V., (Saint Petersburg State University)
Published:
1. Shibanov Yu.A., Beskin G.M., Karpov S.V., Plokhotnichenko V.L., Zyuzin D.A., Kholtygin A.F., Sokolov V.V., Baryishev Yu.V., International Conference "Physics of Neutron Stars -2017", The Open Access Journal of Physics: Conference Series (JPCS)
2. Beskin G.M., Karpov S.V., Plokhotnichenko V.L., Shibanov Yu.A., Zyuzin D.A., Kholtygin A.F., Sokolov V.V., Baryshev Yu.V., The International Conference SN 1987A, Quark Phase Transition in Compact Objects and Multimessenger Astronomy, 2-8 July 2017

Observed confirmation of the presence of the third component in the CI Cam system
The orbital solution of the radial velocity curve of wind-lines for the CI Cam as a triple system suggests a possible presence of the third massive component. It is just the close passage of the third component in 2009 which is associated with the system's transition to an active stage; this stage manifested itself in the brightness increase in all photometric bands, growth of the He II 4686A emission, extreme change of radial velocity curve of the white dwarf, and in the change of double-mode pulsations for single-mode.
Authors: Barsukova E.A., Valeev A.F., Burenkov A.N., Klochkova V.G., Panchuk V.E., Yushkin M.V. (SAO RAS); Goranskij V.P., Metlova N.V. (SAI MSU); Bjorkman K.S., Manset N., Miroshnichenko A.S. (USA), Zharikov S.V. (Mexico).
Published:
Goranskij V.P., Barsukova E.A., Bjorkman K.S., Burenkov A.N., Klochkova V.G., Manset N., Metlova N.V., Miroshnichenko A.S., Panchuk V.E., Yushkin M.V., and Zharikov S.V., ASP Conference Series V508, 307-312, 2017, "B[e] Star CI Cam: Eighteen Years of Research"

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