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Red giants in open clusters. I. Binarity and stellar evolution in five Hyades-generation clusters : NGC 2447, 2539, 2632, 6633 and 6940.

J. C. Mermilliod, Michel Mayor

Abstract

Les observations de vitesses radiales de 62 geantes rouges dans les amas ouverts de type Hyades NGC 2447, NGC 2539, NGC 2632, NGC 6633 et NGC 6940 sont presentees. Les orbites sont analysees pour determiner les binaires. La photometrie et les elements orbitaux sont etablis

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Key concepts: Physics, Astrophysics, Open cluster, Astronomy, Star cluster, Stars