2004/03/08 by Pasi Hakala, Gavin Ramsay, P. J. Wheatley +5 · 16 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Cataclysmic variable star #Dwarf nova #Emission spectrum #High-pressure geophysics and materials #Laser-Plasma Interactions and Diagnostics #Light curve #Luminosity #Meteorology #Modulation (music) #Noise (video) #Orbital period #Outflow #Physics #Spectral line #Stars #White dwarf #astro-ph
paper · pdf · doi:10.1051/0004-6361:20035843
published in Astronomy and Astrophysics 420(1), 273-281 (EDP Sciences) · 9 pages, accepted for publication in A&A
arxiv created 2004/03/08 · openalex publication_date 2004/05/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 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.