Difference between the optical flickering colours of cataclysmic variables and symbiotic recurrent novae

Abstract

We performed simultaneous observations in 3 bands (UBV) of the flickering variability of the recurrent novae RS Oph and T CrB at quiescence. Using new and published data, we compare the colours of the flickering in cataclysmic variables and symbiotic recurrent novae. We find a difference between the colours of the flickering source in these two types of accreting white dwarfs. The detected difference is highly significant with $p-value\approx 2\times 10^{-6}$ for the distributions of $(U-B{)}_0$ colour and $p\approx 3\times 10^{-5}$ on (U-B) versus (B-V) diagram. The possible physical reasons are briefly discussed. The data are available upon request from the authors.

accepted in Astronomische Nachrichten (Astronomical Notes): 2015, AN 336,

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• A comparative study of the strength of flickering in cataclysmic variables
• Active phases and flickering of a symbiotic recurrent nova T CrB