Abstract
On three nights in February 1976 we carried out polarimetric measurements, in V, of the short periodic eclipsing binary XY UMa, covering a complete cycle. The results are as follows: (1) Within all phase intervals the linear polarization does not exceed 0.1%. (2) In the phase range 0p.95–1p.35 the scatter of the Stokes parametersQ andU is about twice that within the phase interval 0p.35–0p.95. (3) A periodogram analysis of these data revealed a period of 21000 s, which is equal to half the orbital periodPo=0d.47899 within 1.5%.
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