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Polars: Polarised Optical Emission
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Cyclotron emission is elliptically polarised
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linearly polarised viewed perpendicular to field
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circularly polarised viewed along the field
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position angle traces magnetic field line projected on sky
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Diagnostic power very strong
ST LMi
HU Aqr
Cropper (1996)
Harrop-Allin, Potter & Cropper (2001)