Intermediate-age open clusters as discriminators between overshooting and classical evolutionary models

Details Intermediate-age open clusters as discriminators between overshooting and classical evolutionary models Intermediate-age open clusters as discriminators between overshooting and classical evolutionary models

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..148m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 148-158.

Astronomy and Astrophysics

Astrophysics

76

Astronomical Models, Hertzsprung-Russell Diagram, Open Clusters, Stellar Evolution, Color-Magnitude Diagram, Main Sequence Stars, Praesepe Star Clusters, Red Giant Stars

Scientific paper

Eight intermediate-age open clusters are examined in order to compare their color-magnitude diagrams with a set of new isochrones, derived from models in which overshooting from convective cores is taken into account. Luminosity functions and synthetic clusters are used as a needed support in the analysis. The VandenBerg's isochrones are considered to make a comparison in the classical evolutionary scheme. With the new overshooting models it is demonstrated that, in the range of age under consideration, the main-sequence gap is due only to stochastic effects or binarity. The main-sequence curvature is explained and the red giant distributions of this group of clusters as anticipated by Barbaro and Pigatto (1984) is confirmed. A best fit all over the cluster HR diagram is obtained with the isochrones and the clusters age with an uncertainty as low as 10 percent is determined.

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