Polarimetric Observations Of 44 Iota Bootes

Linear optical observed polarization of visual binary 44l Boo was measured with the Belgrade polarimeter in the period 1983-1990. The aim of the polarimetric observations was the investigation of possible polarization changes that are correlated with similar to 0.(d)2678 photometric change. The star has high galactic latitude (b=70 degrees) and very possibly zero interstellar polarization what would lead to the observed polaric being equal to the intrinsic one. Detected polarization could be interpreted as due to scattering in circumstellar envelopes. Time variation, if detected, may lead to some important conclusions about geometry of the system.The polarization percentage ranges between 0.01% and 0.19% and polarization angles take almost all values between 0 and 180 degrees. Fourier analysis of polarization percentage data fails to give clear evidence of time dependent polarization, On the other side, statistical test (Pfeiffer, 1977.) for Q and U Stokes parameters leads to strong time variation of parameter Q, but not for U.