Variable Stars in Globular Clusters and in Related Systems

1. Front Matter

   Pages I-IX

   PDF

2. General Problems of Variables in Population II Systems

   1. Front Matter

      Pages 1-1

      PDF

   2. Variables in Globular Clusters, the Common and the Rare

      • Helen Sawyer Hogg

      Pages 3-7

   3. Some Problems in the Study of Variable Stars in Globular Clusters

      • B. V. Kukarkin

      Pages 8-20

   4. Observations of Faint Globular Clusters

      • L. Rosino, G. Pinto

      Pages 21-25

   5. Planetary Nebulae, Globular Clusters and the Galactic Halo

      • Sidney Van Den Bergh

      Pages 26-28

   6. An Abundance Analysis of Fehrenbach’s Star (HD 116745) in Omega Centauri

      • R. J. Dickens, A. L. T. Powell

      Pages 29-30

   7. On the Nature of the 41-Day Cycle of RR Lyrae

      • L. Detre, B. Szeidl

      Pages 31-34

   8. Variable Stars in Dwarf Spheroidal Galaxies

      • Steven Van Agt

      Pages 35-48

3. RR Lyrae Variables in Population II Systems

   1. Front Matter

      Pages 49-49

      PDF

   2. Observational Aspects of RR Lyrae Variables in Globular Clusters

      • L. Rosino

      Pages 51-67

   3. New Variable Stars in the Globular Cluster NGC 6401

      • A. Terzan, B. Rutily

      Pages 68-75

   4. Variable Stars in NGC 4590

      • A. Terzan, B. Rutily, Ch. Ounnas

      Pages 76-81

   5. Two-Colour Photometry of RR Lyrae Variables in NGC 6981

      • R. J. Dickens, Rosalind Flinn

      Pages 82-83

   6. Intermediate Band Photometry of RR Lyrae Variables in ω Cen and 47 Tuc

      • D. H. P. Jones

      Pages 84-87

   7. UBV Magnitudes and Colours of 62 RR Lyrae Stars in ω Centauri (NGC 5139)

      • E. H. Geyer

      Pages 88-94

   8. Two-Color Observations of RR Lyrae Stars in M14

      • Amelia Wehlau, Nicholas Potts

      Pages 95-100

   9. On the Changes of Periods of RR Lyrae Variables in the Globular Clusters M5, M53 and NGC 5053

      • V. P. Goranskij, B. V. Kukarkin, N. N. Samus’

      Pages 101-103

   10. Period and Period Changes of RR Lyrae Variables in M15

       • A. J. Wesselink

       Pages 104-104

   11. Period Changes as Evidence for Evolution in ω Cen

       • Emilia Pisani Belserene

       Pages 105-112

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.

• Galaxy
• LOPES
• Population
• galaxies
• photometry
• planet
• star
• stars

• David Dunlap Observatory, University of Toronto, Toronto, Canada

  J. D. Fernie

Policies and ethics