Two-dimensional Simulation of Convection in a Red Giant Envelope

Details Two-dimensional Simulation of Convection in a Red Giant Envelope Two-dimensional Simulation of Convection in a Red Giant Envelope

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491l..47a&link_type=abstract

Astrophysical Journal Letters v.491, p.L47

Astronomy and Astrophysics

Astronomy

6

Convection, Methods: Numerical, Stars: Agb And Post-Agb, Stars: Atmospheres

Scientific paper

The problem of modeling the convection in red giant envelopes is addressed with two-dimensional nonlinear and nonadiabatic simulations. Hydrostatic envelopes, in thermal equilibrium, were integrated using the mixing-length theory (MLT) for different values of the mixing-length parameter lambda . We examined the energy balance for two-dimensional simulations by using the MLT envelopes as initial model. On the basis of these two-dimensional simulations, we identify a model that is close to two-dimensional equilibrium. Such a model is characterized by an initial mixing-length parameter. Its value depends upon the numerical resolution, varying from 1.0 for low resolution to 1.5 for the best resolution at present.

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