Abstract
We present calculations of the efficiency of magnetic braking in synchronously rotating magnetic binary systems, following the formulation of Li, Wu & Wickramasinghe. We show that, for the observed range of magnetic field strengths typical of AM Herculis binaries, the braking efficiency has been overestimated by a large factor in current models. Our calculations also show that the orbital evolution of the high-field AM Herculis binaries is driven by the loss of orbital angular momentum due to gravitational radiation rather than magnetic braking, if these are the oniy two competing mechanisms.
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