COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 2750 Konkoly Observatory Budapest 19 June 1985 HU ISSN 0374 - 0676 UBV OBSERVATIONS OF SYMBIOTIC STARS IN JULY AND OCTOBER 1982 The observations were made using the Polarimeter II Martel (Chevreton et al. 1977) mounted at the Cassegrain focus of the 80 cm telescope at the Haute- Provence Observatory. Polarization measurements for the observed symbiotic stars did not yield significant results. Each measurement relating to a variable star is given within the limits taken from similar measurements made for one or more comparison stars as indicated below: Variable Stars Comparison Stars AG Dra BD +67 925 CH Cyg BD +49 2994 HM Sge BD +28 3438 CI Cyg BD +35 3964, BD +35 3825, BD +35 3821 V 1016 Cyg HD 194279 HBV 475 No.1 NGC 6910 AG Peg BD +11 4681 Z And BD +48 4066, BD +47 4192 EG And HD 3765 AX Per No.2 NGC 581, BD +53 340 MWC 17 No.2 NGC 581 RW Aur BD +30 748 The results of UBV measurements of the variable stars are given in Table I, together with the date and time in hundredths of the Julian day of the observation. Our values of UBV for Z And, AG Peg and CI Cyg are in good agreement with results obtained by Belyakina (1984 and 1985) except that the values of U-B for CI Cyg are much lower than the minimum read from the curve given by Belyakina for CI Cyg in 1982. If all the measured stars, with the exception of EG And, have U-B values between -0.30 and -1.10, the B-V values can be used to divide the stars into two classes : 1) those of type Z And with B-V>1 magnitude 2) [BQ] stars and protoplanetary nebulae with 0.10