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Recurrent Symbiotic Nova T Coronae Borealis before Outburst.
- Source :
- Astronomy Letters; Sep2023, Vol. 49 Issue 9, p501-515, 15p
- Publication Year :
- 2023
-
Abstract
- 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 for the times of light minima when the red giant is located between the observer and the hot component. The flux ratio H /H varied from to 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 H /H 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 line with a characteristic time-scale of min, the amplitude of variability in the -band was . 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 , the mass ratio , the orbital inclination . 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- LIGHT curves
RED giants
ROCHE equipotentials
NOVAE (Astronomy)
ACCRETION disks
Subjects
Details
- Language :
- English
- ISSN :
- 10637737
- Volume :
- 49
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Astronomy Letters
- Publication Type :
- Academic Journal
- Accession number :
- 175080841
- Full Text :
- https://doi.org/10.1134/S1063773723090037