Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-12-05
Astronomy and Astrophysics
Astrophysics
7 pages, 14 postscript figures, accepted for publication on MNRAS
Scientific paper
10.1046/j.1365-8711.1999.02193.x
We present new evolutionary stellar models suitable for old Population I clusters, discussing both the consequences of the most recent improvements in the input physics and the effect of element diffusion within the stellar structures. Theoretical cluster isochrones are presented, covering the range of ages from 1 to 9 Gyr for the four selected choices on the metallicity Z= 0.007, 0.010, 0.015 and 0.020. Theoretical uncertainties on the efficiency of superadiabatic convection are discussed in some details. Isochrone fitting to the CM diagrams of the two well observed galactic clusters NGC2420 and M67 indicates that a mixing length parameter alpha = 1.9 appears adequate for reproducing the observed color of cool giant stars. The problems in matching theoretical preditions to the observed slope of MS stars are discussed.
Castellani Vittorio
Degl'Innocenti Scilla
Marconi Marcella
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