COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       NUMBER 881

                                  Konkoly Observatory
                                  Budapest
                                  1974 April 6



                         ANNOUNCEMENT



   IAU Colloquium No. 29, the sixth in the Bamberg-Budapest series,
will be held in Budapest on 1 - 5 September 1975, with the theme
"Multiple Periodic Variable Stars". The meetings will be held at the
Hungarian Academy of Sciences, which will also act as hosts for the
Colloquium.
   The announcement is being sent to members of IAU Commissions 27
and 42, and to a number of other individuals and institutions. We 
anticipate that the scientific program will consist of about 15 invited
review papers and about 30 additional invited contributions. In view
of the limited number of presentations, and also of the limited 
facilities available, we encourage applications for two types of 
invitations - first those who wish to attend and participate in the 
discussions, and second, those who wish to present a contribution 
pertinent to the theme of the Colloquium.
   Applications for either type of invitation should be sent to
Dr. W. S. Fitch, Steward Observatory, University of Arizona, Tucson,
Arizona 85721, U.S.A. In addition, applicants for invitations to
contribute papers should include a title and an abstract of their
proposed contribution. Applications should be received in Tucson prior
to 1 January 1975, so that they may be reviewed and selected by the
organizing committee, and a list of invited participants who will 
require visas placed in the hands of the Hungarian authorities by 1
April 1975. The Chairman of the Local Organizing Committee is Professor
L. Detre, 1121 Budapest, Konkoly Thege M. ut 13/17, Hungary.

   The preliminary program is as follows:

   1. Beta Canis Majoris Stars
   2. Cepheids
   3. Mira Variables
   4. White Dwarfs and Novae
   5. Magnetic-Variables
   6. RR Lyrae Stars
   7. Delta Scuti and RRs Stars
   8. Eclipsing Variables

    In general, each topic will be introduced by two invited speakers,
one for theory and one for observation. Contributed papers may be
either theoretical or observational. The proceedings of the 
Colloquium will be published by the Reidel Publishing Company. Further
details will be sent to participants later.


                     	The Scientific Organizing Committee

                     	M. W. Feast.
			W. S. Fitch (Chairman)
			B. V. Kukarkin
			P. Ledoux
			J. Smak
     			R. S. Stobie
 			B. Szeidl
			B. Warner
			S. C. Wolff