Linear polarization of a group of symbiotic systems

We report linear polarization measurements of a set of symbiotic stars, mad e at several epochs during the period 1994-1998. Evidence of intrinsic pola rization is looked for from the wavelength dependence of the polarization d egree, and position angle in UBVRI bands. The results have also been analys ed to search for temporal variability of polarization. Several objects have shown a polarization spectrum different from that produced by interstellar dust grains and/or polarimetric variations on time scales as short as seve ral days or months, indicating the presence of polarization component of ci rcumstellar origin.