Strong flickering from the recurrent nova T Coronae Borealis
ATel #16023; M. Minev, R. Zamanov, K. Stoyanov (Institute of Astronomy and NAO, Bulgarian Academy of Sciences)
on 30 Apr 2023; 12:31 UT
Credential Certification: R. K. Zamanov (rkz@astro.bas.bg)
Subjects: Optical, Cataclysmic Variable, Nova
T CrB is a famous recurrent nova with prior eruptions in 1866 and 1946. In 2015, T CrB entered an super-active state (Munari, Dallaporta & Cherini, 2016, NewA, 47, 7) that is likely preceding its next outburst (Schaefer 2023, MNRAS).
On April 28, 2023 (from UT 19:49 till UT 23:49), we observed the flickering of T CrB in three filters (UBV) using the 50/70 cm Schmidt telescope of the Rozhen National Astronomical Observatory (Bulgaria). The brightness of the star varies from 10.01 to 10.10 in V band, 11.14-11.40 in B band, 11.08-11.64 in U band. The typical observational errors are 0.005 mag in V, 0.006 in B, and 0.008 in U bands.
We observed a strong flickering with peak-to-peak amplitude 0.56 mag in U band, and 0.26 mag in B band. The flickering amplitude is larger than that observed in January 2023 (ATel #15916) and is more similar to that observed before the active state (see ATel #8675).
Does it mean that the super-active state is over?
Acknowledgments: projects KP-06-H28/2.
Fig.1 Strong flickering from T CrB on 28 April 2023.
