The polarimetric orbit of Z Andromedae.

Repeated Raman line polarimetry of the Z And symbiotic system shows that both the percent polarization, and the polarization angle, are locked to the binary motion. It is thus possible to determine the otherwise unobservable system inclination and orbit orientation on the celestial sphere. We find an inclination of i=47+/-12° and an orbit orientation {OMEGA}=72+/-6°. Inserting the inclination in the previously known mass function yields a most likely mass of the stellar hot component of about 0.65M_sun_ which is typical for a single white dwarf.