Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..225p&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 225-239. Research supported by the Swiss National Science Foundation
Astronomy and Astrophysics
Astrophysics
90
Chemical Composition, Chronology, Open Clusters, Stellar Evolution, Stellar Structure, Convective Flow, Hertzsprung-Russell Diagram, Spectrum Analysis, Stellar Mass, Stellar Models, Stellar Temperature
Scientific paper
Evolutionary tracks and theoretical isochrones are constructed for two chemical compositions (X, Y, Z) equals (0.70, 0.27, 0.03), (0.72, 0.27, 0.01) under the assumption of negligible overshooting from convective cores. The input physics include a value of 1.5 for the mixing length of nonadiabatic convection, essentially adiabatic core convection, the Cox-Stewart radiative opacities, and masses ranging from 0.79 to 10 solar masses. Effects of changes in chemical composition on the position of the theoretical ZAMS and on age estimates in the vertical segment of the isochrones are examined. The ages and turnup masses of nine open clusters are determined from UBV observations as well as by main-sequence fitting to the observational ZAMS of Eggen (1965); ages are also estimated for ten parent clusters. It is found that: (1) the present evolutionary models are somewhat hotter than those of Hejlesen et al. (1972) for the same chemical composition, mixing length, input physics, and mass; and (2) the age obtained for the Hyades is a reasonably good fit, but the nuclear ages for the young clusters may be uncertain by as much as a factor of 2.
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