COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 401 Konkoly Observatory Budapest 1969 November 10 PHOTOELECTRIC OBSERVATIONS OF EV Lac The results of photoelectric observations of the flare star EV Lac carried out at the Crimean Astrophysical Observatory in the period of 6-26 August 1969 are given here. The observations were obtained in the B-band with the 84 cm meniscus telescope. The time coverage is shown in Table 1. The total coverage was 48h15m, and 15 flares were observed. Table 2 contains the flare characteristics according to (1). The light curves of the flares have the relative intensities (Io+f-Io)/Io as ordinates and Universal Time as abscissae. [FIGURE 1] Table 1. Date 1969 Coverage U.T. August 6 22.18-34, 22.36-55, 22.57-23.15 8 20.24-21.36, 21.38-59, 22.01-09, 23.12-37 9 00.07-14, 00.16-1.10, 01.12-14, 21.17-25, 21.23-44, 21.47-23.20, 23.43-23.51, 23.56-24.00 10 00.00-00.06, 00.07-00.32, 00.33-00.52, 00.53-1.10, 1.12-17, 19.37-40, 19.42-57, 19.59-20.02, 11 18.27-29, 18.31-49, 18.51-55, 18.58-19.04, 19.05-07, 19.09-13, 19.23-42, 19.44-52, 19.55-20.11, 20.13-33, 20.34-55, 20.57-21.18, 21.20-27, 21.28-41, 21.43-22.02, 22.03-20, 22.27-31, 22.55-59, 12 19.39-57, 19.58-20.16, 20.17-39, 20.41-21.06, 21.07-16, 21.55-58, 22.38-47, 22.48-11, 23.15-35, 13 00.03-23, 00.25-47, 00.49-01.01, 01.03-10, 18.50-53, 18.55-19.13, 19.14-16, 19.18-40, 19.41-20.31, 20.33-53, 21.01-22, 21.24-46, 21.47-22.16, 22.18-56, 23.06-16, 23.48-60, 14 00.00-10, 00.11-32, 00.33-54, 00.56-01.05, 01.06-15, 21.20-25, 21.27-49, 22.22-29, 22.30-40, 15 18.19-26, 18.27-49, 18.50-58, 20.33-38, 20.40-60, 21.07-30, 21.31-44, 21.45-52, 21.54-22.16, 22.17-36, 22.38-59, 23.02-05, 23.08-41, 23.42-00.02, 16 00.04-33, 00.39-01.00, 01.10-13, 01.15-22, 01.24-30, *(19.34-46, 19.47-20.17, 20.21-24, 20.26-28, 20.43-49, 20.50-21.11, 21.12-21, 21.23-33, 21.35-55, 21.56-22.19, 22.20-25, 22.55-59) 17 *(21.19-21, 21.22-44, 21.45-22.12, 22.30-48, 22.49-23.14, 23.16-17, 23.18-38, 23.39-00.06) 18 00.10-31, 00.33-38, 00.40-56, 01.00-03, 01.04-15, 01.16-22, 01.23-29, 01.31-36, 21.02-07, 21.10-15, 21.22-29, 21.30-33, 21.35-51, 21.54-58, 22.00-06, 20 21.18-23, 21.24-45, 21.46-22.08, 22.15-21, 21 18.13-18, 18.19-26, 18.28-50, 18.55-19.17, 19.18-39, 19.40-20.01, 20.02-25, 20.27-47, 20.48-51, 21.12-21, 21.22-46, 21.47-22.08, 22.09-32, 22.34-37, 22.45-59, 23.00-22, 23.23-46, 23.47-56, 23.58-00.09, 22 00.10-32, 00.34-49, 00.55-58, 00.59-01.09, 01.14-25, 01.26-35 23 18.11-13, 18.20-30, 18.37-58, 19.00-22, 19.23-32, 21.55-22.01, 22.02-25, 22.52-23.14, 23.15-36, 23.37-58 24 00.00-20, 00.23-44, 00.46-01.09, 01.11-23, 01.27-32, 01.33-40, 18.28-48, 18.49-10, 19.12-45, 19.52-20.09, 20.11-26, 20.28-42, 20.45-21.08, 21.10-30, 21.32-52, 21.53-22.15, 22.18-33, 22.34-51, 22.52-23.13, 23.17-30, 23.32-55, 23.57-00.18, 25 00.19-28, 00.29-40, 01.30-37, 01.39-43, 21.23-22.34, 22.37-52, 22.54-59, 23.35-56, 23.57-00.11, 26 00.13-28, 00.30-38, 00.40-1.00 * Cirrus Table 2. Date and U.T. Duration of flare Before after Integr. maximum 1969 maximum int. Air August t_b t_a m m_lim min. mass 13 19h57m.6 1.6m 12.4m 0.60 0.03 1.34 1.42 15 20 40.7 0.4 1.8 0.38 0.03 0.46 1.27 22 29.0 0.2 1.0 0.12 0.04 0.05 1.05 23 00.0* <3.0 >26.0 >1.21 0.02 >25.8 1.03 16 00 44.1 0.2 1.1 0.16 0.02 0.07 1.01 21 15.8** 0.5 2.0 0.10 0.02 0.09 1.09 17 21 55.7** 2.8 >14.5 1.27 0.07 >10.20 1.09 18 00 22.4 0.5 5.5 0.28 0.03 0.32 1.00 21 43.0 0.2 3.0 0.48 0.03 0.33 1.02 21 18 57.9 0.2 2.1 0.19 0.02 0.14 1.30 22 47.0 0.2 1.2 0.11 0.02 0.03 1.00 23 21 06.0 0.7 2.4 0.12 0.02 0.17 1.12 23 48.0 0.3 2.9 0.32 0.02 0.24 1.00 24 19 20.0 2.3 13.8 0.91 0.02 3.65 1.10 21 11.0 0.2 0.9 0.14 0.02 0.04 1.04 * Record out of scale ** Cirrus [FIGURE 2] [FIGURE 3] K. L. MASLENNIKOV Leningrad State University N.I. SHAKHOVSKAYA Crimean Astrophysical Observatory [References] (1) A.D. Andrews, P.F. Chugainov, R.E. Gershberg, V.S.Oskanjan I.B.V.S. No. 326. 1969.