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From optical high-resolution spectra the nature of the unseen companion of HWVir is determined without detection of any spectral features originating fromthe secondary itself. Using radial velocity measurements from the primary hotsubdwarf B star and from weak additional absorption lines detected close to thesecondary eclipse, probably caused by reflected light off the surface of thesecondary, the mass and radius of the companion is determined. The values areconsistent with those of a M type main sequence star.

HW Vir's Companion: a M-type Dwarf, or maybe a giant rotating spherical Mirror?