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: http://star.arm.ac.uk/highlights/2012/608.html
Дата изменения: Thu Jul 5 16:53:39 2012 Дата индексирования: Tue Oct 2 03:18:48 2012 Кодировка: IBM-866 Поисковые слова: п п п п п п п п п п п п п п п п п п п п |
Gavin Ramsay, Peter J. Wheatley, Simon Rosen, Thomas Barclay, Danny Steeghs
Figure 4. The X-ray spectrum of KL Dra observed during the faint optical state. The best-fit model using an absorbed single temperature thermal model with metalicity appropriate for CNO processed material is shown as a solid line.
Abstract
KL Dra is a helium accreting AM CVn binary system with an orbital period close to 25 mins. Approximately every 60 days there is a 4 mag optical outburst lasting тИ®10 days. We present the most sensitive X-ray observations made of an AM CVn system during an outburst cycle. A series of eight observations were made using XMM-Newton which started shortly after the onset of an optical outburst. We find that X-rays are suppressed during the optical outburst. There is some evidence for a spectral evolution of the X-ray spectrum during the course of the outburst. A periodic modulation is seen in the UV data at three epochs тАУ this is a signature of the binary orbital or the super-hump period. The temperature of the X-ray emitting plasma is cooler compared to dwarf novae, which may suggest a wind is the origin of a significant fraction of the X-ray flux.
Last Revised: 2012 July 5th |