COMMISSION 27 OF THE I. A. U.
      INFORMATION BULLETIN ON VARIABLE STARS
                   Number 516

                                 Konkoly Observatory
                                 Budapest
                                 1971 February 8

       PROGRAMME OF COOPERATIVE OBSERVATIONS
             OF FLARE STARS FOR 1971

     The Working Group on Flare Stars after consultations with members
announces programmes of cooperative optical observations in 1971.

Principal programmes
YZ CMi                  January   16 - February 2
AD Leo                  February  18 - March 4
EV Lac                  September 11 - September 27
UV Cet                  October   11 - October 27

Additional programmes
  BD + 16d 2708 	March 20 - April 2
  V 645 Cen 		April 18 - May 2
  V 1216 Sgr		June  16 - June 30

     X-ray observations of flare stars are planned by NASA ASE Group
(IBVS 466). Unfortunately, sky coverage is restricted by spacecraft construction
therefore it is impossible that periods of X-ray observations correspond to 
abovementioned optical programmes where stars under consideration are in opposite to
Sun. X-ray observation programmes: Orion flare star region centered on
a = 5h 34m delta = -5d28' during February 16,19 and 23; March 11, 13 and 16;
YZ CMi March 15 to 20th; AD Leo April 13 to 18th:
     Optical observers are asked to take part in these periods as well. 
Observatories and personal workers who were not participating in cooperative observations
are requested to join our programmes if possible.

     A.D. ANDREWS	       P.F. CHUGAINOV (Chairman)
    Armagh Observatory      Crimean Astrophysical Observatory

     V.S. OSKANIAN             E.M. KELLOGG
    Bjurakan Observatory    American Science Engineering