SIMBAD references

The magnetic torques resulting from an asynchronous white dwarf in an AM Herculis binary are considered. The magnetic field induced in the secondary leads to an orbital torque which affects the evolution rate of its Roche lobe. An over-synchronous primary transfers angular momentum to the orbit which significantly reduces the rate of shrinkage of the lobe, for a range of asynchronous periods. Although the effect on the total evolution time of the binary is small, the temporarily reduced accretion rate has important consequences for the condition to approach synchronism.