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Recurrent Symbiotic Nova T Coronae Borealis before Outburstстатья
Дата последнего поиска статьи во внешних источниках: 24 июля 2024 г.
- Авторы: Maslennikova N.A., Tatarnikov A.M., Tatarnikova A.A., Dodin A.V., Shenavrin V.I., Burlak M.A., Zheltoukhov S.G., Strakhov I.A.
- Журнал: Astronomy Letters
- Том: 49
- Номер: 9
- Год издания: 2023
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 501
- Последняя страница: 515
- DOI: 10.1134/s1063773723090037
- Аннотация: The results of photometric and spectral observations of T CrB obtained in a wide range of wavelengths in 2011-2023 are presented. We use the near-IR light curves to determine a new ephemeris JDmin=2455828.9+227.55E for the times of light minima when the red giant is located between the observer and the hot component. The flux ratio Hα/Hβ varied from ∼3 to ∼8 in 2020-2023, which may be due to a change in the flux ratio between the X-ray and optical ranges. It is shown that the value of Hα/Hβ anticorrelates with the rate of accretion onto the hot component of the system. Based on high-speed follow-up observations obtained on June 8, 2023, we detected a variability of the He II λ4686 line with a characteristic time-scale of ∼25 min, the amplitude of variability in the B-band was ∼0.m07. Simulations of the near-IR light curves accounting for the ellipsoidal effect allowed us to obtain the parameters of the binary system: the Roche lobe filling factor of the cool component μ=1.0, the mass ratio q=Mcool/Mhot∈[0.5,0.77], the orbital inclination i∈[55∘,63∘]. A comparison of the light curve obtained in 2005-2023 with the 1946 outburst template made it possible to predict the date of the upcoming outburst—January 2024.
- Добавил в систему: Татарников Андрей Михайлович