Searching for flickering statistics in T CrB

Abstract

We analyze $V$-band photometry of the aperiodic variability in T CrB. By applying a simple idea of angular momentum transport in the accretion disc, we have developed a method to simulate the statistical distribution of flare durations with the assumption that the aperiodic variability is produced by turbulent elements in the disc. Both cumulative histograms with Kolmogorov-Smirnov tests, and power density spectra are used to compare the observed data and simulations. The input parameters of the model $R_{\mathrm{in}}$ and $\alpha$ are correlated on a certain interval and the most probable values are an inner disc radius of $R_{\mathrm{in}}\simeq 4\times 10^9$ cm and a viscosity of $\alpha \simeq 0.9$. The disc is then weakly truncated. We find that the majority of turbulent events producing flickering activity are concentrated in the inner parts of the accretion disc.

arXiv comment9 pages, 10 figures, accepted for publication in MNRAS

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