ar X iv : a st ro - p h / 99 07 44 6 v 1 3 0 Ju l 1 99 9 Calibrating the Mixing Length Parameter for a Red Giant Envelope
نویسنده
چکیده
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 1997, 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 1.2M ⊙ , core mass of 0.96M ⊙ , luminosity of 200L ⊙ , and metallicity Z = 0.001.
منابع مشابه
ar X iv : a st ro - p h / 96 07 14 6 v 1 2 9 Ju l 1 99 6 An Optical Ultrahigh Resolution Spectrograph for Use with Adaptive Optics
متن کامل
ar X iv : a st ro - p h / 96 11 14 3 v 1 1 9 N ov 1 99 6 A high deuterium abundance in the early Universe
متن کامل
ar X iv : a st ro - p h / 99 07 36 3 v 1 2 6 Ju l 1 99 9 The complete explanation and implications of the deep space anomaly
Shown are that the current notion of cosmological expansion is contradicted by the equivalence principle, and that the correct theory involves a fundamental principle of physical scale predicting the cosmological constant, planetary Hubble flow and all aspects of the deep space anomaly.
متن کاملar X iv : a st ro - p h / 99 07 41 7 v 1 2 9 Ju l 1 99 9 Formation of Elliptical and S 0 Galaxies by Close Encounters
We study a possible formation mechanism for elliptical/S0 galaxies using N-body simulations with GRAPE. A close galaxy encounter which does not lead to a merger can induce a strong bar in an initially axisymmetric disk. This bar is unstable to bending oscillations and loses angular momentum to the dark halo. After 6 Gyrs the remnant is spheroidal with a de Vaucouleurs-type surface density profi...
متن کامل