Variable Stars in Globular Clusters and in Related Systems: by Helen Sawyer Hogg (auth.), J. D. Fernie (eds.)

By Helen Sawyer Hogg (auth.), J. D. Fernie (eds.)

This quantity includes the papers and discussions at IAU Colloquium No. 21 on Variable Stars in Globular Clusters and in similar platforms held in Toronto at the twenty ninth, thirtieth and thirty first August 1972. It used to be the goal of the organizers that this assembly should still honour the existence lengthy paintings during this box of Professor Helen Sawyer Hogg. She has been constantly energetic in observational examine on variables in globular clusters for forty six years and her catalogues and bibliographies in addition to her examine papers, overview articles and IA U studies as chairman of the committee on variable stars in clusters are of primary value to all staff during this box. The scope of the colloquium coated either observational and theoretical points of the matter, together with the connection of variables to non-variable cluster participants, the placement of the variables within the HR diagram and their value for difficulties of stellar evolution, empirical information at the variables, classes and interval alterations, and the proper elements of pulsation thought. The assembly was once quite winning in bringing jointly observers and theorists. it's going to have accomplished its item if it has proven either observers and theorists that are the issues most fitted for assault this day. The assembly basically established the nice value of study on variables in globular clusters and similar structures for our realizing either one of stellar evolution and stellar pulsation.

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Extra resources for Variable Stars in Globular Clusters and in Related Systems: Proceedings of the IAU Colloquium No. 21 Held at the University of Toronto, Toronto, Canada August 29–31, 1972

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These observations were made with the 24/36in. Michigan Curtiss Schmidt telescope at Cerro Tololo, Chile. The 5° x 5° field of the Curtiss Schmidt telescope, which has a plate scale of 97':2 mm - 1, accommodates the dimensions of the Sculptor system well. Intercomparison of ten plate pairs of the Sculptor system yielded a rich harvest of over 500 variable stars. The total number of variable stars in this spheroidal galaxy, including those discovered earlier by Baade and Hubble, Thackeray and collaborators, Helen Hogg, who also blinked a plate pair, and the author is now over 600.

Astr. Torino, Nuova Serie, No. 27. : 1943, Mitt. Sternw. Ungar. Akad. Wiss. 17. XIB,295. : 1969, Non-Periodic Phenomena in Variable Stars, Academic Press, Budapest. : 1970, Ann. -Sternw. 2, 79. Hardie, R. : 1955, Astrophys. J. 122, 256. Onderlicka, B. : 1968, As/ron. Inst. Univ. Brno (Czechoslovakia), Pub!. 8. Preston, G. : 1964, Ann. Rev. Astron. Astrophys. 2, 46. Preston, G. : 1965, Astrophys. J. 12, 99. Preston, G. : 1967, in R. C. , Baltimore, p. 26. : 1965 Mitt. Sternw. Ungar. Akad. Wiss. No.

I. Roy. Astron. Soc. 12, 320. 28 SIDNEY VAN DEN BERGH DISCUSSION Feast: (1) Griffin's radial velocities will possibly increase IJJlIL for globular clusters by a moderately large factor. (2) It is important in your calculations that the ratio of planetaries in the region of galactic centre to globular clusters there is much greater than in the halo. van den Bergh: The observations by Wilson and Coffeen (Astrophys. 119, 197, 1954) and by Griffin (Observatory 92, 29, 1972) refer to different clusters.

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