Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-22
Mon.Not.Roy.Astron.Soc.372:1593-1601,2006
Astronomy and Astrophysics
Astrophysics
10 pages, 8 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10957.x
We show that the combination of a weak magnetic propeller and accretion disc resonances can effectively halt accretion in short period cataclysmic variables for large fractions of their lifetimes. This may help to explain the discrepancy between the observed and predicted orbital period distributions of cataclysmic variables at short periods. Orbital resonances cause the disc to become eccentric, allowing material to fall back onto 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 (~10^11 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 for a classical propeller model.
Matthews O. M.
Truss Michael R.
Wheatley Peter J.
Wynn Graham A.
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