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.

During the past decade, the field of astrophysics has progressed at an impressive rate. This was reflected by the topics discussed at the workshop from which this book eminated. These topics include the inflationary universe; the large-scale structure of the universe; the diffuse X-ray background; gravitational lenses, quasars and active galactic nuclei; infrared galaxies; results from infrared astronomical satellites; supernova 1987A; millisecond radio pulsars; quasi-periodic oscillations in the X-ray flux of low-mass X-ray binaries; and gamma-ray bursts.

Een bonbonnetje van een boek over ons universum en de sterrenkunde Wanneer je op een heldere nacht omhoog kijkt, kun je duizenden sterren aan de hemel zien staan. Elke ster kent een eigen verhaal dat ons uitleg geeft over het ogenschijnlijk oneindige universum. Aan de hand van 21 van deze sterren - plus 3 bedriegers die feitelijk gezien geen sterren zijn - beschrijft sterrenkundige Giles Sparrow de geschiedenis van het heelal, van het ontstaan tot de meest recente ontdekkingen en inzichten. Over zwarte gaten, supernova's, witte dwergsterren en rode superreuzen; over bekende sterren als de Poolster en de zon: wie nieuwsgierig is naar de wereld buiten onze aarde, gaat in dit boek mee op de ontdekkingstocht die generaties van wetenschappers eerder aflegden. Sparrow geeft bovendien aanwijzingen voor het sterrenkijken zelf. Doe zoals Albert Einstein al adviseerde: 'Kijk naar de sterren en leer van ze.' * onder redactie van wetenschapsjournalist Govert Schilling * hét cadeau voor elke sterrenliefhebber * aantrekkelijk laagdrempelige uitleg * mooi gebonden en geïllustreerd boek met fonkelende gouden sterren 'Dankzij goed gekozen voorbeelden, een feilloos taalgevoel en een mespuntje Britse humor is deze geschiedenis van ons heelal een heel plezierig en laagdrempelig boek dat uitpuilt van de interessante informatie.' - Govert Schilling, auteur van De olifant in het universum

From the reviews: Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundamental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ... The abstracts are classified under more than hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Reviews #1 "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine #1