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XMM-Newton observations of the dwarf nova YZ Cnc in quiescence
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Hakala, P., Ramsay, G., Wheatley, P. J., Harlaftis, E. T. and Papadimitriou, C. (2004) XMM-Newton observations of the dwarf nova YZ Cnc in quiescence. Astronomy and Astrophysics, Volume 420 (Number 1). pp. 273-281. doi:10.1051/0004-6361:20035843
An open access version can be found in:
Official URL: http://dx.doi.org/10.1051/0004-6361:20035843
Abstract
We present results from the XMM-Newton 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 ${\sim}1.4\times 10^{32}$ ergs/s, although this is consistent with a low binary inclination. Finally, we find evidence for a possible -1200 km s -1 blue shift in the fitted Fe K line energies, possibly indicating the presence of an outflow in this low inclination system.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Astronomy and Astrophysics | ||||
| Publisher: | EDP Sciences | ||||
| ISSN: | 0004-6361 | ||||
| Official Date: | 2004 | ||||
| Dates: |
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| Volume: | Volume 420 | ||||
| Number: | Number 1 | ||||
| Page Range: | pp. 273-281 | ||||
| DOI: | 10.1051/0004-6361:20035843 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Open Access Version: |
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