XMM-Newton observations of the asynchronous polar BY Cam

Details XMM-Newton observations of the asynchronous polar BY Cam XMM-Newton observations of the asynchronous polar BY Cam

2002-03-25

arxiv.org/abs/astro-ph/0203444v1

Mon.Not.Roy.Astron.Soc. 334 (2002) 805

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS, 7 pages

Scientific paper

10.1046/j.1365-8711.2002.05536.x

We report observations of the asynchronous polar BY Cam made using XMM-Newton. We find evidence for two accretion regions which have significantly different spectra. In both regions we find evidence for hard X-ray emission from the post-shock flow while we observe a distinct soft X-ray blackbody component in only one. We detect two emission lines in the RGS detectors which we attribute to Nitrogen NVI and NVII: the first time that Nitrogen lines have been detected in an X-ray spectrum of a cataclysmic variable. In the time interval where we observe short timescale variability we find the hard X-ray light curve is correlated with the softest energies in the sense that the hard X-rays trail the soft X-rays and are anti-correlated. We suggest that there are a small number of dense blobs of material which impact the white dwarf without forming a shock and release an amount of optically thick material which obscures hard X-rays for a short duration.

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