The recurrent nova T CrB - decrease of the U band brightness
ATel #16213; R. Zamanov, E. Semkov, A. Kostov, S. Boeva, G. Latev (Bulgarian Academy of Sciences)
on 27 Aug 2023; 19:04 UT
Credential Certification: R. K. Zamanov (rkz@astro.bas.bg)
Subjects: Optical, Cataclysmic Variable, Nova
Referred to by ATel #: 16337
On 25 August 2023 (from UT 18:47 till UT 20:52), we observed the flickering of the recurrent nova T Coronae Borealis in three filters (UBV) using the 50/70 cm Schmidt telescope of the Rozhen National Astronomical Observatory (Bulgaria). The brightness of the star varied
from 11.65 to 11.76 in B band and from 12.32 to 12.55 in U band. The typical observational errors were 0.006 mag in V, 0.007 in B, and 0.011 in U bands.
We observed flickering with peak-to-peak amplitude 0.23 mag in U band and 0.11 mag in B band. No flickering was detected in V band, the brightness was constant V=10.22 +/- 0.02.
A comparison with our previous observations obtained on 24 May 2023, shows that the brightness is decreased by of about 1 magnitude in U band, by 0.5 mag in B band, and the amplitude of the flickering is lower.
Flickering of T CrB on 25 August 2023.
