Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apjs..116..263p&link_type=abstract
Astrophysical Journal Supplement v.116, p.263
Astronomy and Astrophysics
Astronomy
28
Stars: Hertzsprung-Russell Diagram, Galaxy: Open Clusters And Associations: General, Stars: Evolution
Scientific paper
New CCD VI photometric data for 10 template open clusters with accurately determined fundamental parameters are presented. From the observed V versus V - I diagrams of the clusters, fiducial sequences have been defined and transformed into the Mv versus (V - I)0 diagram by averaging sequences of template open clusters with similar ages. The resulting composite Mv versus (V - I)0 diagram presents a homogeneous set of empirical isochrones in the age range between 5 Myr and 4 Gyr. These empirical isochrones show an overall very good agreement with those computed from stellar evolutionary models. Theoretical isochrones with moderate overshooting fit the observed main sequences better than the canonical ones for clusters older than 600 Myr. The present set of empirical isochrones will be useful for the study of faint reddened open clusters
Bica Eduardo
Claria Juan J.
Piatti Andrés E.
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