An outburst of the magnetic cataclysmic variable XY Arietis observed with RXTE

Details An outburst of the magnetic cataclysmic variable XY Arietis observed with RXTE An outburst of the magnetic cataclysmic variable XY Arietis observed with RXTE

1997-08-08

arxiv.org/abs/astro-ph/9708077v1

Astronomy and Astrophysics

Astrophysics

10 pages, 9 figures, LaTeX, also at http://www.astro.keele.ac.uk/~ch/

Scientific paper

We report the first observed outburst of the magnetic cataclysmic variable XY Ari. X-ray observations show a flux increase by an order of magnitude the day after the first signs of outburst. During the 5-d duration the X-ray spin pulse is greatly enhanced and the X-ray spectrum far more absorbed. We suggest that the inner disc pushes inwards during outburst, blocking the view to the lower accreting pole, breaking the symmetry present in quiescence, and so producing a large pulsation. The observations are consistent with a disc instability as the cause of the outburst, although we can't rule out alternatives. We draw parallels between our data and the UV delay and dwarf nova oscillations seen in non-magnetic dwarf novae.

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