Magnetic systems: history
€AM Her
is a V~13.5 variable star which Berg & Duthie (1977) suggested is the
optical counterpart of a source in the Uhuru catalog (also a SAS-3 source) with a period
of ~3.1 hr
€Lightcurve was unlike that of other CVs: too variable for Dwarf Novae and
Nova-like CVs, no eclipses
€In
1976, polarimetry
obtained
by Tapia,
showed large
circular polarisation variations on orbital period.
€Largest circular polarisation seen in any celestial object:
hence ŚPolarą
AM
Her
Tapia (1977)