On the ultimate fate of AM Her stars

Details On the ultimate fate of AM Her stars On the ultimate fate of AM Her stars

1999-05-06

arxiv.org/abs/astro-ph/9905068v1

Astronomy and Astrophysics

Astrophysics

accepted for publication in A&A letters

Scientific paper

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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