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This volume contains the papers and discussions at IAU Colloquium
No. 21 on Variable Stars in Globular Clusters and in Related
Systems held in Toronto on the 29th, 30th and 31st August 1972. It
was the intention of the organizers that this meeting should honour
the life long work in this field of Professor Helen Sawyer Hogg.
She has been continuously active in observational research on
variables in globular clusters for 46 years and her catalogues and
bibliographies as well as her research papers, review articles and
IA U reports as chairman of the committee on variable stars in
clusters are of fundamental importance to all workers in this
field. The scope of the colloquium covered both observational and
theoretical aspects of the 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, empirical data on the variables, periods and
period changes, and the relevant parts of pulsation theory. The
meeting was particularly successful in bringing together observers
and theorists. It will have achieved its object if it has shown
both observers and theorists which are the problems most suitable
for attack at the present time. The meeting clearly demonstrated
the great importance of research on variables in globular clusters
and related systems for our understanding both of stellar evolution
and stellar pulsation.
This volume contains the papers and discussions at IAU Colloquium
No. 21 on Variable Stars in Globular Clusters and in Related
Systems held in Toronto on the 29th, 30th and 31st August 1972. It
was the intention of the organizers that this meeting should honour
the life long work in this field of Professor Helen Sawyer Hogg.
She has been continuously active in observational research on
variables in globular clusters for 46 years and her catalogues and
bibliographies as well as her research papers, review articles and
IA U reports as chairman of the committee on variable stars in
clusters are of fundamental importance to all workers in this
field. The scope of the colloquium covered both observational and
theoretical aspects of the 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, empirical data on the variables, periods and
period changes, and the relevant parts of pulsation theory. The
meeting was particularly successful in bringing together observers
and theorists. It will have achieved its object if it has shown
both observers and theorists which are the problems most suitable
for attack at the present time. The meeting clearly demonstrated
the great importance of research on variables in globular clusters
and related systems for our understanding both of stellar evolution
and stellar pulsation.
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