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Recurrent Symbiotic Nova T Coronae Borealis before Outburst

Strakhov, I. A.; Tatarnikov, A. M.; Shenavrin, V. I. +5 more

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 $JD_{\textrm{min}}=2455828.9+227.55E$ for the times of light minima when the red giant is located between the observer and the hot component. The flux ratio H…