Reduced Magnetic Braking in Synchronously Rotating Magnetic Cataclysmic Variables

Details Reduced Magnetic Braking in Synchronously Rotating Magnetic Cataclysmic Variables Reduced Magnetic Braking in Synchronously Rotating Magnetic Cataclysmic Variables

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268...61l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 1/MAY1, P. 61, 1994

Astronomy and Astrophysics

Astronomy

52

Mhd - Stars: Magnetic Fields - Novae, Cataclysmic Variables

Scientific paper

A model for magnetic braking via a stellar wind for synchronously rotating magnetic binaries is presented. It is found that the magnetic field lines of the secondary form closed loops or connect to the field lines of the white dwarf primary, leading to a reduction of the magnetic flux in open field lines responsible for magnetic braking. We show in particular that, for parameters typical for AM Herculis-type binary systems, magnetic braking is drastically reduced in comparison to values that are usually adopted based on wind theories for single stars. The cut-off in magnetic braking is sharp, occurring at a polar field strength of about 7 × 107 G for an AM Herculis-type binary system with a white dwarf mass of 0.7 Msun and an orbital period of 5 h.

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