Cataclysmic Variables - X-rays and Optical Activity

Presentation duration: 15 minutes

Presenter: Rudolf Galis

Intermediate polars represent a major fraction of all cataclysmic variables detected by INTEGRAL in hard X-ray. These object have been recently proposed to be the dominant X-ray source population detected near the Galactic centre and they also contribute significantly to the X-ray diffuse Galactic ridge emission. Nevertheless, only 25 % of all known intermediate polars was detected in hard X-ray so far. This fact can be related with activity state of these close interacting binaries. Multi-frequency (from optical to X-ray) investigation of intermediate polars is essential to understand physical mechanisms responsible for observed activity of these objects.

L. Hric & E. Kundra, Astronomical Institute of Slovak Academy of Sciences, Tatranská Lomnica, Slovak republic.