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Are the Cepheids in Cluster Nuclei a Rare Breed?

Published online by Cambridge University Press:  12 April 2016

D. G. Turner
D. G. Turner*
Affiliation:
Department of Astronomy, Saint Mary’s University, Halifax, Nova Scotia, B3H 3C3, Canada

Extract

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As reviewed by Kholopov (1968), star counts for a variety of open clusters reveal the existence of low density coronal regions surrounding the nuclear concentrations of most star clusters. Such cluster coronae have diameters 2.5 to 5 times larger than the respective nuclear diameters for clusters which are poor to medium-rich in member stars, and have star densities only about 10% those observed in cluster nuclei. Cluster coronae therefore contain roughly 40% to 70% of the stars in an open cluster, and are subsequently a (or, more appropriately, the) major component of most star clusters.

Type
Part III. Extragalactic Cepheids and the PL Relation
Information
International Astronomical Union Colloquium , Volume 82: Cepheids: Theory and Observations , 1985 , pp. 209 - 211
Copyright
Copyright © Cambridge University Press 1985

References

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