RS Oph - disappearance of the optical flickering
ATel #14974; R. Zamanov, K. Stoyanov, A. Kostov, S. Boeva, M. Moyseev (Institute of Astronomy and NAO, Bulgarian Academy of Sciences), J. Marti, P. L. Luque-Escamilla (Universidad de Jaen, Spain)
on 15 Oct 2021; 13:58 UT
Credential Certification: R. K. Zamanov (rkz@astro.bas.bg)
Subjects: Optical, Cataclysmic Variable, Nova, Variables
CCD photometry of the recurrent nova RS Oph has been performed with the 50/70 cm Schmidt telescope of the Rozhen National Astronomical Observatory (Bulgaria) and the 41 cm telescope at the Observatory of the University of Jaen (Spain) on 2021 September 2, October 4 and October 7.
We have not detected flickering on minute-to-hour time scale with amplitude greater than 0.05 mag.
At quiescence RS Oph exhibits variability on minute-to-hour time scale with amplitude 0.2-0.3 mag in B band. The flickering disappeared after the 2006 outburst and was first detected 240 days later (Worters et al. 2006, MNRAS, 379, 1557).
The cessation of the flickering in our latest observations, indicates that the accretion disc around the white dwarf is destroyed by the 2021 nova outburst. For our understanding of the disc-flickering connection in the symbiotic binaries, it will be important to follow the UBV bands and to detect when and how the flickering will re-appear.
[Acknowledgments: projects KP-6-H28/2 and AEI 501100011033]
RS Oph - disappearance of the optical flickering
