Dynamo action and the period gap in cataclysmic variables

Details Dynamo action and the period gap in cataclysmic variables Dynamo action and the period gap in cataclysmic variables

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.314..398l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 314, Issue 2, pp. 398-402.

Astronomy and Astrophysics

Astronomy

3

Magnetic Fields, Mhd, Stars: Activity, Stars: Magnetic Fields, Novae, Cataclysmic Variables

Scientific paper

The conjecture is presented that the gap in the distribution of the orbital periods of cataclysmic variables is related to a particular kind of hydromagnetic dynamo, called an interface dynamo, operating near the base of the convective envelope of their secondary components. Such a dynamo is characterized by the spatial separation of the regions where differential rotation and the α effect operate. Unlike conventional dynamos, the linear growth rate of an interface dynamo becomes negative for highly supercritical dynamo numbers, leading to the disappearance of the dynamo action. If such a result, from linear theory, is confirmed by non-linear calculations, it may provide a physical basis for the so-called disrupted magnetic braking hypothesis, invoked to explain the existence of the period gap by several evolutionary models of cataclysmic variables.

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