COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 492

                             Konkoly Observatory
                             Budapest
                             1970 November 29


       FLARE STAR OBSERVATIONS DURING SATELLITE
               X-RAY EXPERIMENTS

      In IBVS No. 488 the A. S. and E. group announced that
the SAS-A spacecraft would be directed to survey flare
stars during 1971. We have proposed that the following 
observing periods be utilised:

	YZ CMi 25-31 January 1971
	YZ CMi 19-25 February 1971
	AD Leo 18-24 March 1971

	Subject to the launch date of 12 December 1970,
Dr. E. Kellogg, the Project Scientist for SAS-A project,
has agreed that two days will be spent monitoring YZ CMi
within the dates suggested in January. The exact dates will
be announced 30 days in advance. Observations during the
later periods will depend on the initial results and other
commitments.
	We propose to activate the optical flare star 
program of the Smithsonian Astrophysical Observatory using
twelve Baker-Nunn cameras on these dates (Solomon 1986). We
appeal to optical and radio astronomers to supplement this
coverage. We draw the attention of potential observers to
the recent prediction of x-ray emission from flare stars
(Grindlay 1970); the intensity predicted is well within the
range of the SAS-A spacecraft.

November 19, 1970

                           T. C. WEEKES
                       Smithsonian Institution
                       Mt. Hopkins Observatory
                          P. O. Box 97
                       Amado, Arizona 85840

References
Grindlay, J. E., Astrophysical Journal, 162, 187, 1970. [BIBCODE 1970ApJ...162..187G ]
Solomon, L., Smithsonian Special Report, No, 210, 1986 [BIBCODE 1966SAOSR.210.....S ]

Note:
   Should the dates mentioned be in conflict with the
program of cooperative observations for 1971 to be named
by Commission 27 we request immediate notification so that
these proposed dates can be modified.