Z Cam in outburst during the ROSAT All-Sky Survey.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion, Accretion Discs -- Binaries: Close -- Stars: Individual: Z Camelopardalis -- Novae, Cataclysmic Variables -- White Dwarfs -- X-Rays: Stars, Dwarf Novae: Outbursts, Dwarf Novae: X-Ray Light Curves, Dwarf Novae: Radiation Mechanisms, Dwarf Novae: Light Curves, Dwarf Novae: Extreme Uv

Scientific paper

The authors present the first X-ray observations of the dwarf nova Z Cam taken during outburst. ROSAT survey observations show that Z Cam conforms to the pattern of X-ray behaviour seen in other dwarf novae, i.e. the quiescent hard X-ray emission is suppressed during outburst and replaced by extreme ultraviolet emission which declines more rapidly than the optical flux. The timing of the hard X-ray suppression is measured with precision for the first time in any system.

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