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Ages, age differences, masses of stars in young open clusters

Published online by Cambridge University Press:  04 August 2017

Anne Marie Jakobsen
Anne Marie Jakobsen*
Affiliation:
University of Aarhus, Carlsberg Foundation Fellow, Denmark Kitt Peak National Observatory∗ P. O. Box 26732, Tucson, Arizona 85726, U.S.A.

Abstract

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An extensive amount of accurate uvby Hβ data has been obtained for stars in young open clusters. Age spread earlier found within the clusters has been confirmed. Many unevolved stars have been observed. The data for these stars are positioned below ZAMS curves in HR diagrams defined by the Strömgren indices. These unevolved stars form a confined lower envelope for all the stars a little below the “normal” ZAMS curves.

Type
II. EVOLUTION OF MASSIVE STARS EVOLUTION AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 345 - 348
Copyright
Copyright © Reidel 1984