Where are the progenitors of magnetic cataclysmic variables (polars)?

Details Where are the progenitors of magnetic cataclysmic variables (polars)? Where are the progenitors of magnetic cataclysmic variables (polars)?

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.172a2040l&link_type=abstract

Journal of Physics: Conference Series, Volume 172, Issue 1, pp. 012040 (2009).

Physics

Scientific paper

As over a thousand white dwarf plus M dwarf composite spectrum binaries with high quality spectra are now tabulated from the Sloan Digital Sky Survey alone, a remarkable discovery has been made. No pairing of a magnetic white dwarf of two megagauss or greater field strength with an M dwarf has been found. At this field strength, Zeeman splitting of hydrogen or helium lines would be detectable. Thus there are no known progenitors of magnetic cataclysmic variables - AM Herculis systems or polars. The formation of the strong magnetic field by a dynamo mechanism within the common envelope of a binary system has been proposed as the possible explanation.

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