COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1528 Konkoly Observatory Budapest 1978 December 29 FLARE STARS AND FLARE-UPS IN THE PLEIADES REGION By the program of flare star observations in stellar clusters and aggregates systematic investigations of the Pleiades field were continued on during the past years. The method of the observations was the same, as it was published earlier (1, 2, 3, 4). In Asiago the plates were taken by the 67/90 cm Schmidt-telescope, at the Konkoly Observatory by the 60/90 cm Schmidt (on the Mt. Matra, at Piszkesteto). Here we bring the results of our survey as follows: first column - designation/s/ of the object (A=Asiago, B=Byurakan, K=Konkoly and T=Tonantzintla); second column - coordinates for 1900.0; third column - minimum brightness of the object; 4th column - amplitude of the observed flare; 5th column - date of the phenomenon. Table I ---------------------------------------------------------------------- 1 2 3 4 5 Object alpha delta minimum ampl. date of flare-up ---------------------------------------------------------------------- A 151 3h39m58s 23d 9.2' 17m pg 1.3m 17 12 1973 A 152 46 09 26 4.4 17.1 pg 1.6 18 12 1973 A 153=A 104= 41 40 24 35.0 15.3 pg 1.0 26 12 1973 = H II 1485 A 154=T 79 39 37 24 54.8 16.6 pg 1.8 28 12 1973 A 155 42 32 22 41.1 16.9 pg 0.9 29 12 1973 A 156=T 63 34 07 24 10.6 17.0 pg 1.3 21 01 1974 K 36 38 00 25 32 16.9 U 3.3 24 11 1975 K 37=B 178 47 12 25 14 18.7 U 2.8 24 11 1975 K 38 50 00 22 49 16.5 U 1.3 24 11 1975 K 39 39 00 24 27 17.9 U 5.4 24 11 1975 K 40=T 12b 47 24 25 38 18.3 U 2.3 24 11 1975 K 41=B 118 37 21 24 20 18.5 U 4.2 25 11 1975 K 42 42 42 23 28 16.5 U 1.6 25 11 1975 K 43=A 95= 46 24 24 17 17.2 U 1.9 26 11 1975 =B 115=T 159 K 44 37 00 23 12 18.5 U 4.0 26 11 1975 K 45 46 00 23 58 18.0 U 1.5 26 11 1975 K 46 45 00 21 36 17.2 U 1.2 26 11 1975 K 47 44 30 24 05 17.5 U 1.3 18 02 1976 K 48 38 42 25 28 17.9 U 1.2 18 02 1976 K 49=A 85= 42 36 22 07 18.7 U 2.7 18 02 1976 =T 86 K 50 44 36 24 35 16.6 U 1.5 18 01 1977 ------------------------------------------------------------------- L. ROSINO G. SZECSENYI-NAGY Istituto di Astronomia Eotvos University Univ.di Padova Department of Astronomy and I-35100 Italy, and Konkoly Observatory Osservatorio Astrofisico Hungarian Academy of Sciences di Asiago Budapest References: (1) Rosino, L., Contr. di Asiago No. 189, 1966 (2) Balazs, L.G., Kun, M., Szecsenyi-Nagy, G., I.B.V.S. No. 803, 1973 (3) Szecsenyi-Nagy, G., I.B.V.S. No. 898, 1974 (4) Szecsenyi-Nagy, G., I.B.V.S. No. 996, 1975