Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.2090d&link_type=abstract
Astronomical Journal v.109, p.2090
Astronomy and Astrophysics
Astronomy
57
Open Clusters And Associations: Individual: Ngc 188, Open Clusters And Associations: Individual: M 67, Open Clusters And Associations: Individual: Ngc 752
Scientific paper
Theoretical isochrones have been constructed using the OPAL opacities to derive the ages of the open clusters NGC 188, M67, and NGC 752 as well as to estimate the amount of convective overshoot at the convective core edge. We find that-under the assumptions made in the models-no overshoot, or a very small amount (up to 0.1 Hp) is allowed for the best fits. Very good agreement is achieved between models and the main sequence, turnoff, subgiant, and giant branch for the clusters NGC 188 and M67. For NGC 188 and M67 we derive the ages: 6.0+1.0-0.5 Gyr and 4.0±0.5 Gyr, respectively, where the main uncertainty is due to the estimate of the interstellar reddening. The age of NGC 752 is 2.0+0.5-0.3 Gyr if the adopted metallicity is [Fe/H] = - 0.27.
Demarque Pierre
Dinescu Dana I.
Guenther David B.
Pinsonneault Marc H.
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