Dissipation Efficiency in Turbulent Convective Zones in Low Mass Stars

Details Dissipation Efficiency in Turbulent Convective Zones in Low Mass Stars Dissipation Efficiency in Turbulent Convective Zones in Low Mass Stars

2008-10-29

arxiv.org/abs/0810.5145v3

Astrophys.J.704:930-936,2009

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures Effective viscosity scaling changed by a factor of ~100. More details provided for the numerical models

Scientific paper

10.1088/0004-637X/704/2/930

We extend the analysis of Penev et al. (2007) to calculate effective viscosities for the surface convective zones of three main sequence stars of 0.775Msun, 0.85Msun and the present day Sun. In addition we also pay careful attention to all normalization factors and assumptions in order to derive actual numerical prescriptions for the effective viscosity as a function of the period and direction of the external shear. Our results are applicable for periods that are too long to correspond to eddies that fall within the inertial subrange of Kolmogorov scaling, but no larger than the convective turnover time, when the assumptions of the calculation break down. We find linear scaling of effective viscosity with period and magnitudes at least three times larger than the Zahn (1966, 1989) prescription.

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