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Inhomogeneities in Globular Clusters

Published online by Cambridge University Press:  25 April 2016

Mun-Suk Chun
Affiliation:
Department of Astronomy and Atmospheric Science, Yonsei University, Seoul, Korea

Abstract

Inhomogeneities in globular clusters are reviewed with the observational evidence for chemical abundance variations from star to star in individual clusters and the large-scale structural variation of clusters. The reality of the radial colour gradient is tested in 47 Tuc (NGC 104). The result shows that the observed radial colour gradient comes from the integration of the calculated colours of individual stars. The cause of this radial colour variation is the result of the concentration of evolved stars and the reddening of the main sequence in the central region. We propose that the CNO abundance gradient in the early stage of a cluster’s formation is the interpretation of the observed radial colour gradient.

Type
Invited
Copyright
Copyright © Astronomical Society of Australia 1991

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