Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..539d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 539-547.
Astronomy and Astrophysics
Astrophysics
19
Astronomical Models, Convection, Mixing Length Flow Theory, Stellar Structure, Turbulence Models, Turbulent Mixing, Giant Stars, Hertzsprung-Russell Diagram, Open Clusters, Stellar Evolution
Scientific paper
The performance of the model proposed by Canuto and Mazzitelli (CM) (1991, 1992) for turbulent convection is tested with reference to stellar objects other than the sun. A comparison of the new evolutionary tracks and isochrones, computed within the CM framework, with the H-R diagram features of the open cluster M67, is presented. The CM isochrones are adequate to reproduce the general features of the HR diagram morphology, at least as well as the mixing length theory isochrones. The CM model appears to be even more efficient at matching the observed red giants, though this may depend on the inferred temperatures of the few cluster giants. It is concluded that the CM model has also passed the test for the red giants. A choice as the best theoretical fit for M67 is made in favor of the one obtained by increasing the distance modulus of the cluster from the current accepted value of 9.7 to 9.9.
D'Antona Francesca
Gratton Raffaele G.
Mazzitelli Irene
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