Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357..177c&link_type=abstract
Astronomy and Astrophysics, v.357, p.177-179 (2000)
Astronomy and Astrophysics
Astrophysics
4
Convection, Stars: Interiors
Scientific paper
Several authors have recently carried out 2D simulations of turbulent convection for both solar and massive stars. Fitting the 2D results with the MLT, they obtain that alpha MLT > 1 specifically, 1.4 <= alpha MLT <= 1.8. The authors further suggest that this methodology could be used to calibrate the MLT used in stellar evolutionary codes. We suggest the opposite viewpoint: the 2D results show that MLT is internally inconsistent because the resulting alpha MLT > 1 violates the MLT basic assumption that alpha MLT < 1. When the 2D results are fitted with the CM model, alpha MLT < 1, in accord with the basic tenet of the model. On the other hand, since both MLT and CM are local models, they should be replaced by the next generation of non-local, time dependent turbulence models which we discuss in some detail.
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