COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 771

                                      Konkoly Observatory
                                      Budapest
                                      1973 February 28

        NEW FLARE STARS IN THE PLEIADES


On 14 plates of the 50/70/172
cm Schmidt-type telescope at
Sonneberg Observatory in the
period from 1972 September 6
to 1973 January 6 seven new
flare stars were discovered. Of
two previously known objects,
No. 157 (G. Haro, E. Chavira, Flare
Stars in the Pleiades Region
II. Tonantzintla y Tacubaya Bol.
5., p. 181) and No. 196 (V.A.
                                              [FIGURE 1]
Ambartsumyan et al., Flare Stars in
Pleiades, II. Astrofisika 7, p.
319.) flares were observed.
The effective observational time
amounts to 42.6 hours. The observations 
were made on 53 different
exposures (3 to 5 per plate and
40 to 60 minutes for each) in blue
(ORWO-ZU2-emulsion + filter GG 13)
and ultraviolet ORWO-ZU 2-emulsion + filter UG 2)
light.
The Table (s. overleaf) summarizes the data of the
flare stars: the variable star number of Sonneberg 
Observatory, the position 1900.0, the brightness 
in minimum in B or U, the observed amplitudes of the flares
in B or U (DeltaB, DeltaU), the mean Julian Dates of the exposures in 
maximum brightness and their duration. The Table also comprises the
known flare stars 157 and 196.
In the Figure identification charts are given. They represent 
areas approximately 4' x 4'. North is on the top.




                    Data for Observed Flares
-----------------------------------------------------------------------------------
No. Design.      RA   1900.0  D    B_min U_min    DeltaU          J.D.      Exp.
                                             DeltaB               244....   time
-----------------------------------------------------------------------------------
1   S 10767      3h37.0m   +25d00'  17.0m      0.5                1596.540   60 min
2   S 10768      3 38.7    +24 17  >17.5      >1.1                1683.317   40
3   S 10769      3 40.5    +22 44   17.3       1.2                1597.519   60
4   S 10770      3 42.2    +24 12   17.4       0.6                1600.513   40
5   S 10771      3 43.4    +24 30   17.3       0.6                1595.507   60
6   S 10772      3 44.4    +22 22   17.0       0.5                1601.542   40
7   S 10773      3 44.8    +24 28   17.1 >17.7     >0.9           1682.264   60
        157      3 43.1    +23 26   17.1       0.9                1597.519   60
                                    17.1       0.6                1602.604   40
        196      3 39.3    +24 15        >17.8     >0.8           1685.333   50
-----------------------------------------------------------------------------------



 February 9, 1973               W. GOTZ

                      Akademie der Wissenschaften der DDR
                        Zentralinstitut fur Astrophysik
                           Sternwarte Sonneberg