Calibrating the Mixing Length Parameter for a Red Giant Envelope

Details Calibrating the Mixing Length Parameter for a Red Giant Envelope Calibrating the Mixing Length Parameter for a Red Giant Envelope

1999-07-30

arxiv.org/abs/astro-ph/9907446v1

Astrophys.J. 528 (2000) 896

Astronomy and Astrophysics

Astrophysics

18 pages, 1 table, 13 figures. Accepted for publication in Ap.J

Scientific paper

10.1086/308211

Two-dimensional hydrodynamical simulations were made to calibrate the mixing length parameter for modeling red giant's convective envelope. As was briefly reported in Asida & Tuchman (97), a comparison of simulations starting with models integrated with different values of the mixing length parameter, has been made. In this paper more results are presented, including tests of the spatial resolution and Large Eddy Simulation terms used by the numerical code. The consistent value of the mixing length parameter was found to be 1.4, for a red giant of mass 1.2 solar-mass, core mass of 0.96 solar-mass, luminosity of 200 solar-luminosities, and metallicity Z=0.001.

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