The UV delay in dwarf novae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion, Accretion Discs, Instabilities, Novae, Cataclysmic Variables, Ultraviolet: Stars

Scientific paper

I show that irradiation by the white dwarf truncates the quiescent accretion discs in dwarf novae outside the radius of this star, leaving only a hot-state disc region of very low surface density within this radius. This causes the delay in the ultraviolet rise in outburst, and the absence of a steady boundary layer in quiescence. I discuss the quiescent ultraviolet and X-ray emission of these systems.

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