Abstract
The AM Her-type of mass-transfer binary displays strong circular polarization in its optical flux, due to high harmonic cyclotron emission from the vicinity of the accretion shock. Circular polarization is the best direct evidence for magnetic white dwarf primaries in these cataclysmic variable (CV) systems, indicating high field strengths of B≥10 7 G. For more than a decade, we have carried out an optical and infrared polarimetric observing program at Steward Observatory to search for AM Her systems and to detect circularly polarized light in CV systems in which a magnetic white dwarf may be present
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