Journal Article

Searching for flickering statistics in T CrB

A. Dobrotka, L. Hric, J. Casares, T. Shahbaz, I. G. Martínez-Pais and T. Muñoz-Darias

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 4, pages 2567-2574
Published in print March 2010 | ISSN: 0035-8711
Published online March 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16068.x
Searching for flickering statistics in T CrB

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We analyse 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 Rin and α are correlated on a certain interval and the most probable values are an inner disc radius of Rin≃ 4 × 109 cm and a viscosity of α≃ 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.

Keywords: accretion, accretion discs; stars: individual: T CrB; novae, cataclysmic variables

Journal Article.  5604 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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