COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS Number 2499 Konkoly Observatory Budapest 28 March 1984 HU ISSN 0374-0676 UBV OBSERVATIONS FOR ELEVEN KNOWN VARIABLE STARS Twelve known variables and six suspected variable stars were included in a photoelectric UBV survey of 317 selected photographic and visual zenith tube stars (Guetter single beam photometer attached to the 1-meter Ritchey- Chretien reflector at the U.S. Naval Observatory, Flagstaff Station. A cooled EMI 9658R photomultiplier was employed with a filter set selected to transform the measures to the standard UBV system. HD 7351 = BD+27d196 = NSV 444 01h 11.3m +28d 16' 244 5633.801 6.36 1.66 1.95 244 5653.731 6.46 1.70 1.94 244 5655.720 6.40 1.66 1.92 244 5658.665 6.40 1.67 1.91 244 5673.668 6.42 1.66 1.92 244 5674.624 6.40 1.67 1.91 HD 21242 = BD+28d532 = UX Ari 03h 23.5m +28d 33' 244 5633.882 6.44 0.90 0.44 244 5658.810 6.52 0.89 0.42 244 5674.712 6.41 0.92 0.45 244 5681.765 6.54 0.89 0.37 244 5684.756 6.50 0.90 0.42 244 5687.736 6.44 0.92 0.44 HD 34269 = BD+42d1239 = PU Aur 05h 14.7m +42d 44' 244 5633.967 5.62 1.57 1.67 244 5647.943 5.60 1.57 1.66 244 5653.931 5.78 1.56 1.61 244 5674.767 5.57 1.60 1.68 244 5684.775 5.56 1.59 1.69 244 5687.790 5.55 1.62 1.69 HD 77443 = BD+39d2193 = UX Lyn 09h 00.6m +38d 57' 244 5402.741 6.62 1.53 1.43 244 5410.601 6.59 1.53 1.45 244 5424.750 6.82 1.52 1.35 244 5464.671 6.76 1.53 1.38 244 5465.659 6.72 1.52 1.37 244 5466.653 6.74 1.52 1.37 HD 116581 = BD+37d2404 = NSV 6220 13h 21.6m +37d 18' 244 5402.945 6.11 1.64 1.94 244 5463.780 6.16 1.63 1.34 244 5464.771 6.18 1.63 1.96 244 5473.756 6.13 1.64 1.94 244 5484.737 6.16 1.65 1.94 244 5485.693 6.13 1.64 1.95 HD 139216 = BD+15d2890 = TAU^4 Ser 15h 34.2m +15d 16' 244 5403.037 6.35 1.53 1.09 244 5466.880 6.44 1.52 1.08 244 5484.837 6.58 1.56 1.08 244 5485.812 6.58 1.55 1.08 244 5506.744 6.41 1.56 1.12 244 5513.686 6.34 1.55 1.15 HD 147232 = BD+60d1665 = AT Dra 16h 16.4m +59d 53' 244 5464.898 5.51 1.59 1.73 244 5485.841 5.34 1.60 1.75 244 5506.766 5.43 1.58 1.72 244 5513.711 5.45 1.58 1.71 244 5609.631 5.56 1.57 1.67 244 5610.597 5.57 1.57 1.68 HD 154356 = BD+35d2911 = NSV 8159 17h 01.7m +35d 29' 244 5463.529 6.30 1.55 1.68 244 5464.929 6.32 1.55 1.66 244 5506.810 6.20 1.57 1.74 244 5514.721 6.34 1.55 1.70 244 5610.600 6.14 1.55 1.68 244 5622.594 6.27 1.53 1.59 HD 172380 = BD+39d3476 = XY Lyr 18h 36.5m +39d 37' 244 5466.964 6.03 1.64 1.52 244 5506.864 5.88 1.62 1.51 244 5513.787 5.89 1.62 1.49 244 5610.608 6.13 1.66 1.48 244 5633.604 6.22 1.67 1.49 244 5634.586 6.21 1.66 1.48 HD 201078 = BD+30d4318 = DT Cyg 21h 04.4m +30d 59' 244 5633.640 5.66 0.48 0.30 244 5634.643 5.82 0.56 0.34 244 5647.660 5.93 0.60 0.36 244 5653.607 5.64 0.48 0.30 244 5654.575 5.81 0.58 0.37 244 5655.577 5.84 0.56 0.34 HD 219815 = BD+40d5043 = AN And 23h 16.0m +41d 30' 244 5633.687 6.04 0.22 0.18 244 5647.689 5.98 0.22 0.18 244 5655.643 5.97 0.21 0.18 244 5658.619 5.96 0.20 0.18 244 5673.649 5.98 0.22 0.17 244 5674.615 5.95 0.22 0.17 The average standard deviation of a single V measure for the program stars was +-0.009m. However, the average dispersions in visual magnitude for eleven variables out of the eighteen were +-0.025m or greater. The individual observations for these eleven objects are presented in the accompanying table. Included are the HD and BD numbers, the variable proper name and the 1550 coordinates, followed by the heliocentric Julian date of the observation, the V magnitude, and the (B-V) and (U-B) colors, respectively. H.H. GUETTER and A.V. HEWITT, U.S. Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002, U.S.A. Reference: Guetter, H.H., and Hewitt, A.V. 1984, Publ. A.S.P. (submitted) [BIBCODE 1984PASP...96..441G ]