DUAO Université Nice Côte d'Azur MAUCA 1er semestre 2022

François Teyssier

T CrB Flickering

On January 14, 2023, we observed the flickering of T CrB in B Band at the primary focus of the 1 m telescope Omicron of the Observatory C2PU (Calern - France).
525 images (exposure time = 10s) were obtained from 2023-01-14 03:05 to 04:59 UTC.
The total amplitude detected was 0.125 (0.01) in B band. The observation confirms that flickering persits during the high state, but at a lower level (Zamanov & al.,2016,ATel #8675).
The amplitude increased compared to 2016 obervations along with the continuous decline of the luminosity (delta mag B about 0.37)
The cadency allows to detect very short timescale events (brightenings and dimmings) with durations from 4 mn to 1 mn with respective amplitudes of about 0.03 to 0.01 mag B.