On the magnetic accretor GK Persei in outburst

Details On the magnetic accretor GK Persei in outburst On the magnetic accretor GK Persei in outburst

2003-12-15

arxiv.org/abs/astro-ph/0312380v1

Mon.Not.Roy.Astron.Soc. 349 (2004) 710

Astronomy and Astrophysics

Astrophysics

To appear in MNRAS; 5 pages

Scientific paper

10.1111/j.1365-2966.2004.07539.x

RXTE made 5 X-ray observations of the magnetic accretor GK Per during its 1996 outburst, recording a count rate of ten times the quiescent level. The 351-s spin pulse shows a deep, nearly sinusoidal modulation, in contrast to the weaker, double-humped profile of quiescence. The spectrum shows absorption increased by two orders of magnitude over quiescence. We explain these differences in terms of the changing accretion geometry as the outbursting disc forces the magnetosphere inwards, and discuss the 5000-s X-ray QPOs seen during GK Per's outbursts.

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