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Magnetically moderated outbursts of WZ Sagittae
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Matthews, O. M., Speith, R., Wynn, G. A and West, Richard G. (2007) Magnetically moderated outbursts of WZ Sagittae. Monthly Notices of the Royal Astronomical Society, Volume 375 (Number 1). pp. 105-114. doi:10.1111/j.1365-2966.2006.11252.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2006.11252.x
Abstract
We argue that the quiescent value of the viscosity parameter of the accretion disc in WZ Sge may be αcold∼ 0.01, in agreement with estimates of αcold for other dwarf novae. Assuming the white dwarf in WZ Sge to be magnetic, we show that, in quiescence, material close to the white dwarf can be propelled to larger radii, depleting the inner accretion disc. The propeller therefore has the effect of stabilizing the inner disc and allowing the outer disc to accumulate mass. The outbursts of WZ Sge are then regulated by the (magnetically determined) evolution of the surface density of the outer disc at a radius close to the tidal limit. Numerical models confirm that the recurrence time can be significantly extended in this way. The outbursts are expected to be superoutbursts since the outer disc radius is forced to exceed the tidal (3:1 resonance) radius. The large, quiescent disc is expected to be massive, and to be able to supply the observed mass accretion rate during outburst. We predict that the long-term spin evolution of the white dwarf spin will involve a long cycle of spin-up and spin-down phases.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Wiley | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 11 February 2007 | ||||
Dates: |
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Volume: | Volume 375 | ||||
Number: | Number 1 | ||||
Page Range: | pp. 105-114 | ||||
DOI: | 10.1111/j.1365-2966.2006.11252.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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