On the ultimate fate of AM Her stars
classification
🌌 astro-ph
keywords
dwarfsystemsstarstarswhiteanymoreappearbecomes
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We suggest, that the magnetic field of the white dwarf in AM Her systems loses coupling to the secondary star when the latter becomes non-magnetic at the transition from a late main sequence star to a cool degenerate brown dwarf. This leads to spin-up of the primary white dwarf. After synchronous rotation is lost the systems do not appear as AM Her stars anymore. We discuss the further evolution of such systems.
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