The origin of the magnetic field distribution in accreting white dwarfs

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Cataclysmic Variables, Stellar Magnetic Fields, Stellar Mass Accretion, White Dwarf Stars, Field Strength, Stellar Rotation

Scientific paper

Recent work by King, Frank and Ritter (1985) on the secular evolution of magnetic cataclysmic variables (CVs) has shown that the magnetic moments mu of the white dwarfs in these accreting binary systems must lie in a narrow range of mu between about 10 to the 33rd and 10 to the 34th G cu cm, in order to explain the observed distribution of orbital periods in the synchronous (AM Her) and nonsynchronous (intermediate polar) systems. All other CVs must have considerably weaker fields, where mu is less than about 10 to the 30th G cu cm. Here it is shown that this distribution of field strengths arises naturally because of the tendency for rapid rotation to submerge the magnetic fields in stars, making their surface field strengths considerably weaker than those in the interior.

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