Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-01-05
A. Rutkowski, A. Olech, R. Poleski, M. Sobolewska, P. Kankiewicz, T.Ak and D. Boyd 2010, Acta Astronomica, 60, 337
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepted in Acta Astronomica 2010, 60,337
Scientific paper
We present photometric observations of the dwarf nova 1RXS J053234.9+624755. We performed a detailed analysis of the superoutburst that occurred in August 2009. We found the superhump period to be P_sh=0.057122(14)days. Based on the O-C diagram we conclude that P_sh increased during the plateau at the rate of dP_sh/dt=(9.24 +- 1.4) * 10^-5. Both the O-C analysis and evolution of the superhumps light curve favour the model in which superhumps originate in a variable source located in the vicinity of the hot spot. In addition, the evolution of the light curve suggests that the superhump light source approaches the disc plane as the superoutburst declines. Detailed analysis of the superoutburst plateau phase enabled us to detect a signal which we interpret as apsidal motion of the accretion disc. We detected additional modulations during the final stage of the superoutburst characterized by periods of 104s and 188s which we tentatively interpret as quasi periodic oscillations. Estimations of A_0 and A_n are in agreement with the dependence discovered by Smak (2010) between the amplitude of superhumps and the orbital inclination.
Ak Tansel
Boyd David
Kankiewicz Paweł
Olech Arkadiusz
Poleski Radoslaw
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