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Astron. Astrophys. 319, L25-L28 (1997)

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Letter to the Editor

An eclipse in the X-ray flux from the dwarf nova Z Cha

André van Teeseling

Universitäts-Sternwarte Göttingen, Geismarlandstr. 11, D-37083 Göttingen, Germany

Received 5 December 1996 / Accepted 10 January 1997


Observations obtained with the ROSAT HRI show that the X-rays from the dwarf nova Z Cha in quiescence are eclipsed together with the white dwarf. This confirms the idea that the X-rays are emitted by a narrow boundary layer between the accretion disk and the white dwarf, although a point-like X-ray source near the white-dwarf surface cannot be excluded. The observations further show that during quiescence the mass accretion onto the white dwarf continues, even more than three months after outburst, at a level of [FORMULA] yr-1.

Key words: accretion, accretion disks - stars: individual: Z Cha - cataclysmic variables - X-rays: stars

SIMBAD Objects


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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998