The 1996 dwarf nova outburst of the intermediate polar GK Persei

Details The 1996 dwarf nova outburst of the intermediate polar GK Persei The 1996 dwarf nova outburst of the intermediate polar GK Persei

1999-01-25

arxiv.org/abs/astro-ph/9901344v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. To appear in ASP Conf. Ser. Vol. 157; LaTeX, uses paspconf.sty

Scientific paper

GK Persei is an intermediate polar that exhibits a dwarf nova outburst approximately every 1000 days. During previous outbursts the system has displayed kilo-second quasi-periodic oscillations (QPOs) in X-ray emission. These oscillations are unique in that they are an order of magnitude longer than QPOs usually observed in disc-fed cataclysmic variables. We have detected the optical counterpart of these QPOs in spectrophotometry collected during the 1996 outburst. The presence of these QPOs in Doppler-broadened emission lines originating from the highly-supersonic accretion flow enables us to place useful constraints on the location of the QPO source and its formation mechanism.

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