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Title:
Propeller-activated resonances and the fate of short-period cataclysmic variables
Authors:
Matthews, O. M.; Wheatley, P. J.; Wynn, G. A.; Truss, M. R.
Affiliation:
AA(Laboratory for Astrophysics, Paul Scherrer Institut, Würenlingen und Villigen, CH-5232 Villigen PSI, Switzerland), AB(Department of Physics, University of Warwick, Coventry CV4 7AL), AC(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH), AD(Department of Physics, Durham University, South Road, Durham DH1 3LE)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 372, Issue 4, pp. 1593-1601. (MNRAS Homepage)
Publication Date:
11/2006
Origin:
MNRAS
Astronomy Keywords:
accretion, accretion discs, stars: dwarf novae, stars: magnetic fields
DOI:
10.1111/j.1365-2966.2006.10957.x
Bibliographic Code:
2006MNRAS.372.1593M

Abstract

We show that the combination of a weak magnetic propeller and accretion disc resonances can effectively halt accretion in short-period cataclysmic variables (CVs) for large fractions of their lifetimes. This may help to explain the discrepancy between the observed and predicted orbital period distributions of CVs at short periods. Orbital resonances cause the disc to become eccentric, allowing material to fall back on to the donor star or out of the system. A weak magnetic field on a rapidly spinning primary star propels disc material outwards, allowing it to access these resonances. Numerical and analytic calculations show that this state can be long lived (~1011 yr). This is because the magnetic propeller is required only to maintain access to the resonances, and not to push matter out of the Roche lobe, so that the spin-down time-scale is much longer than that for a classical propeller model.

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