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Comparative Study of Young Open Clusters: Age Determination and Stellar Content

Published online by Cambridge University Press:  14 August 2015

J. C. Mermilliod
J. C. Mermilliod*
Affiliation:
Institut d'Astronomie de 1'Université de Lausanne et Observatoire de Genève

Extract

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75 young open clusters have been divided into 14 age groups on the basis of their MV/U-B diagrams. Composite HR diagrams have been constructed and empirical isochronous curves estimated (Figure 1). The left envelope defines a ZAMS. The mean position of the red giants in the HR diagram has been investigated, as well as the occurrence and location of Ap, Am and Be stars and of blue stragglers. Red giants appear mainly in clumps (shaded area).

Type
August 28 Open Clusters
Information
Symposium - International Astronomical Union , Volume 85: Star Clusters , 1980 , pp. 245
Copyright
Copyright © Reidel 1980