XMM-Newton observations of the dwarf nova YZ Cnc in quiescence

Details XMM-Newton observations of the dwarf nova YZ Cnc in quiescence XMM-Newton observations of the dwarf nova YZ Cnc in quiescence

2004-03-08

arxiv.org/abs/astro-ph/0403178v1

Astron.Astrophys. 420 (2004) 273-281

Astronomy and Astrophysics

Astrophysics

9 pages, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20035843

We present results from the XMM observations of the dwarf nova YZ Cnc in a quiescent state. We have performed a detailed time series analysis of the resulting light curves. Unusually, we do not detect any orbital modulation in the UV, with only marginal evidence for X-ray modulation on this period. Although there are peaks in the X-ray periodograms at periods less than 5000 s, we attribute them to red noise effects and assign significance to them using a novel approach. The variability in the UV and optical bands can also be modelled as a result of aperiodic variability (red noise) in the system. There is evidence that the UV and X-ray fluxes are anti-correlated with a time delay of about 100 s, with the UV lagging behind the X-ray emission. This anti-correlation is intriguing, but is only present on two occasions lasting several 1000 s each. The X-ray spectrum shows similar emission features to other dwarf novae and is well fitted using a multi-temperature emission model. We measure a relatively high X-ray luminosity of ~1.4x10^{32} ergs/s, although this is consistent with a low binary inclination. Finally, we find evidence for a possible -1200km/s blue shift in the fitted Fe K line energies, possibly indicating the presence of an outflow in this low inclination system.

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