Observations of 2001 superoutburst of WZ Sagittae: comparison of the morphology of the UBVRI light curves

Astronomy and Astrophysics – Astrophysics

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Cataclysmic Variables, Stars: Individual (Wz Sge), Ultraviolet: Accretion, Accretion Disks

Scientific paper

We present the analysis of the morphology of the light curves of WZ Sge based on simultaneous multicolour highspeed photometry durings the superoutburst in 2001. Observations started around the middle of the main superoutburst and continued for several nights in each of the subsequent phases of its evolution. For the first time for WZ Sge in a superoutburst a significant difference between the morphology of the U and BVRI light curves was detected. This is interpreted as a consequence of a substantial distinction of the structure and radiation between the inner and outer parts of the accretion disc. Using the space observatory WSO-UV for UV monitoring of the WZ Sge-stars throughout the entire superoutburst cycle one would have an opportunity to explore innermost regions of the accretion discs in these systems, which is important for understanding the physics of accretion processes and the nature of their activity.

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