COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 608 Konkoly Observatory Budapest 1972 January 1 EV Lac and UV Cet Flare stars EV Lac and UV Cet were monitored photoelectrically with the 91-cm reflector of the Okayama Station. We used a new photometer to be described elsewhere for the simultaneous three-color photometry. EV Lac was monitored from 12 to 15 September, 1971, and UV Cet from 11 to 20 October, 1971. The observational results are summarized in Table 1 and 2. Table 1 Flares of EV Lac observed at Okayama, 12 to 15 September, 1971. Date Time of Time of Flares 1971 monitoring max max P Duration sigma Sept (UT) (UT) Delta m 12^d 10^h49^m-11^h20^m U 0.14^mag B 0.05 V 13 10 42 -11 04 U 0.75^mag 0.3^min. 0.09 B 10h44m.5 0.20 0.1 0.8^min 0.06 V 0.12 0.1 0.05 11 26 -12 15 14 11 07 -11 30 15 10 43 -14 17 U 0.66 0.7 2.5 B 11 31.7 0.25 0.1 2.0 V - - - U 0.16 B 0.06 U 1.39 0.9 3.5 V 0.04 B 12 03.6 0.67 0.3 3.5 V 0.28 0.1 3.0 15 24 -16 52 Table 2 Flares of UV Cet observed at Okayama, 11 to 20 October, 1971 Date Time of Time of max. p Duration sigma 1971 Monitoring max. delta m min. mag. Oct (UT) (UT) min. 11^d 14^h44^m-17^h48^m B 16^h37^m.8 0.44 0.12 1.5 0.03 14 14 13 -18 40 B 14 54.8 0.53 0.1 0.5 B 14 58.4 0.36 0.1 0.3 B 16 36.6 1.88 9.5 13.0 0.02 B 16 56.2 0.36 0.1 0.4 B 17 43.7 1.51 0.8 4.0 15 13 06 -18 58 U 15 53.6 1.75 7.0 8.0 0.5 B 15 53.2 0.84 2.2 9.0 0.05 V 16 54.6 0.22 0.4 8.0 0.03 18 17 30 -18 50 19 14 38 -18 20 U 1.63 0.5 B 14 47.4 0.83 0.3 0.8 V 0.26 0.1 U 1.67 2.0 U 0.5 B 15 02.5 1.58 1.3 1.8 B 0.22 V 0.78 0.3 V 0.06 U - - B 18 01.7 0.83 0.8 1.5 V 0.26 0.2 20 12 30 -18 20 U - - B 12 36.7 0.73 0.2 0.8 V 0.27 0.1 U - - B 12 40.3 1.23 0.5 1.0 V 0.48 0.2 U 2.12 0.4 0.2 U 0.5 B 14 05.8 1.36 0.3 0.2 B 0.22 V 0.44 0.1 0.3 V 0.04 U 1.97 - 0.5 B 14 44.1 0.56 0.2 0.3 V 0.21 0.1 0.5 U 3.60 10.0 B 15 59.0 2.65 8.0 5.1 V 1.16 1.8 Tokyo Astronomical Observatory 23 December 1971. K. OSAWA, K. ISCIMURA, Y. SHIMIZU