Searching for flickering statistics in T CrB

Details Searching for flickering statistics in T CrB Searching for flickering statistics in T CrB

2009-11-19

arxiv.org/abs/0911.3804v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

9 pages, 10 figures, accepted for publication in MNRAS

Scientific paper

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 $R_{\rm in}$ and $\alpha$ are correlated on a certain interval and the most probable values are an inner disc radius of $R_{\rm in} \simeq 4 \times 10^9$ 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.

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