COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 595

                               Konkoly Observatory
                               Budapest
                               1971 November 29



       I.A.U. COLLOQUIUM (No. 21) ON VARIABLE STARS
       IN GLOBULAR CLUSTERS AND IN RELATED SYSTEMS


        This colloquium will be held at the University of
Toronto, Toronto, Ontario, Canada on 29, 30, 31 August,
1972 at the invitation of the David Dunlap Observatory. The
colloquium is sponsored by I.A.U. Commission 27 (Variable
Stars) and the intention is that the meeting will honour the
lifelong work in this field by Prof. Helen Sawyer Hogg. The
Scientific Organizing Committee approved by the I.A.U.
Executive consists of: L. Rosino, B.V. Kukarkin, H.S. Hogg,
L. Detre, N. Baker, S. van Agt and M.W. Feast (Chairman).
        It is hoped to cover both observational and theoretical 
aspects of this problem including the relationship of
variables to non-variable cluster members, the position of
the variables in the HR diagram and their importance for
problems of stellar evolution and mass loss, empirical data
on the variables, periods and period changes, and the 
relevant parts of pulsation theory. Provisionally a division
has been made into the following four main topics.

(1) RR Lyrae variables in clusters; observational
    work
(2) Slow Variables (P>1d) in clusters; observational
    work
(3) Population II variables in dwarf spheroidal
    galaxies
(4) Population II variables; theoretical work.

There will be a number of invited introductory
lectures to be followed by contributed papers. Those wishing
to present papers should write to M.W. Feast, Radcliffe 
Observatory, P.O. Box 373, Pretoria, South Africa, as soon as
possible and not later than July 1, 1972.
The local Organizing Committee consists of S.P.S.
Anand, D.A. MacRae and J.D. Fernie (Chairman). A small amount
of money is available for travel grants and this will be
allocated about May 1972. Any application for travel funds
should be made in duplicate to M.W. Feast and J.D. Fernie
(David Dunlap Observatory, University of Toronto, Richmond
Hill, Ontario, Canada).
            


                      M.W. FEAST
            (Chairman of the Scientific Organizing
                       Committee
           and President ad interim of Commission 27)