The intermediate polar GK Persei: An unstable relation of the X-ray and the optical intensities in a series of outbursts

0444767 - ASÚ 2016 RIV FR eng J - Článek v odborném periodiku
Šimon, Vojtěch
The intermediate polar GK Persei: An unstable relation of the X-ray and the optical intensities in a series of outbursts.
Astronomy & Astrophysics. Roč. 575, March (2015), A65/1-A65/8. ISSN 0004-6361. E-ISSN 1432-0746
Institucionální podpora: RVO:67985815
Klíčová slova: accretion disks * radiation mechanisms * cataclysmic variables
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.185, rok: 2015

This analysis shows that the X-ray intensity steeply rises only in the start of the optical outburst and steeply declines only when the optical outburst comes to its end. However, the 1.5-50 keV band intensity saturates and balances on a plateau during the outburst. This study shows that a series of outbursts constitutes more general properties of this discrepancy. I argue that the saturation of the X-ray luminosity in outburst cannot be caused by a dominant increase in X-ray absorption. In the interpretation, large structural changes of the accreting regions at the magnetic poles of the white dwarf occur during the outburst. A buried shock proposed by some authors for polars is also promising for explaining the X-ray light curves of outbursts of GK Per.
Trvalý link: http://hdl.handle.net/11104/0247276