Special Astrophysical Observatory of the Russian Academy of Sciences
UDK 53 Физика
UDK 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
UDK 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
UDK 523 Солнечная система
UDK 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
UDK 52-1 Метод изучения
UDK 52-6 Излучение и связанные с ним процессы
GRNTI 41.00 АСТРОНОМИЯ
GRNTI 29.35 Радиофизика. Физические основы электроники
GRNTI 29.31 Оптика
GRNTI 29.33 Лазерная физика
GRNTI 29.27 Физика плазмы
GRNTI 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
OKSO 03.06.01 Физика и астрономия
OKSO 03.05.01 Астрономия
OKSO 03.04.03 Радиофизика
BBK 2 ЕСТЕСТВЕННЫЕ НАУКИ
BBK 223 Физика
TBK 614 Астрономия
TBK 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
We observe events of dynamic mass transfer in the systems V694 Mon and SS 433. In V694 Mon, accretion occurs from an M5–M6 giant onto a white dwarf, while in SS 433 it occurs from an A4–A7 giant onto a neutron star. Both systems exhibit jets, with SS 433 having relativistic ones. In the symbiotic system V694 Mon, we observed the cessation of the disk accretion over three months in 2018. This was followed by the filling of the white dwarf's Roche lobe over the next three years, leading to the formation of an A4 I star within the Roche lobe by 2024, when hydrodynamic equilibrium was reached. The system is no longer considered symbiotic. In the SS 433 system, the Roche lobe of the neutron star is overfilled, resulting in the formation of a star with a neutron core and a convective envelope, known as a Thorne–Żytkow object. Rare powerful explosions occur accompanied by strong infrared radiation excesses. We interprete these explosions as ejections of the envelope of the neutron star or part of this envelope, these ejections are associated with magnetic activity of the neutron star, specifically a magnetar. Based on the wind speed from the system, we estimate the surface temperature of the newly formed star to be 1.5 million K. The star with the neutron core is the source of the power-law spectrum in optics. This object also causes the ellipsoidal effect in the light curves, and the nutation tidal wave that deflects the relativistic jets.
stars: white dwarfs, neutron, binaries: general, mass transfer; individual: V694 Mon, SS 433
1. Afanasiev V.L. and Moiseev A.V., 2005, Astronomy Lettes, 31, 3, p. 194
2. Barnes A.D., Casares J., Charles P.A., et al., 2006, Monthly Notices of the Royal Astronomical Society, 395, 1, p. 296
3. Brinkman W., Kawai N., Matsuoka M., 1989, Astronomy & Astrophysics, 218, p. L13
4. Doroshenko V.T., Goranskij V.P., Efimov Yu.S., 1993, Information Bulletin on Variable Stars, 3824
5. Goranskij V., 2011, Peremennye Zvezdy, 31, 5, p. 1
6. Goranskij V.P., Zharova A.V., Barsukova E.A., et al., 2018, Astronomer's Telegram, 12227
7. Goranskij V.P., Zharova A.V., Barsukova E.A., et al., 2021, Astronomer's Telegram, 15061
8. Gromadzki M., Mikołaewska J., Whitelock P.A., et al., 2007, Astronomy & Astrophysics, 463, 2, p. 703
9. Hillwig T.C. and Gies D.R., 2008, Astrophysical Journal Letters, 676, 1, p. L37
10. Iijima T., 2002, Astronomy & Astrophysics, 391, p. 617
11. Klochkova V.G. and Panchuk V.E., 2022, Astrophysical Bulletin, 77, 3, p. 292
12. Munari U., Dallaporta S., Castellani F., et al., 2016, New Astronomy, 49, p. 43
13. Podsiadlowski P., 2014, IAU Symposium, 296, p. 45
14. Thorne K.S. and Żytkow A.N., 1977, Astrophysical Journal, 212, 1, p. 832
