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Theoretical estimates of the convective turnover time for low-mass, rotating pre-main sequence stars

Published online by Cambridge University Press:  01 August 2006

L. T. S. Mendes ,
N. R. Landin  and
L. P. R. Vaz
L. T. S. Mendes
Affiliation:
Depto. de Engenharia Eletrônica, UFMG, C.P. 702, 31270-901 B. Horizonte, MG, Brazil email: luizt@cpdee.ufmg.br Depto. de Física, UFMG, C.P. 702, 31270-901 Belo Horizonte, MG, Brazil email: nlandin@fisica.ufmg.br, vaz@fisica.ufmg.br
N. R. Landin
Affiliation:
Depto. de Física, UFMG, C.P. 702, 31270-901 Belo Horizonte, MG, Brazil email: nlandin@fisica.ufmg.br, vaz@fisica.ufmg.br
L. P. R. Vaz
Affiliation:
Depto. de Física, UFMG, C.P. 702, 31270-901 Belo Horizonte, MG, Brazil email: nlandin@fisica.ufmg.br, vaz@fisica.ufmg.br
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Abstract

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The Rossby number Ro is an important quantity related to the well-known magnetic activity-rotation correlation for main sequence, solar-type stars. For such stars, Ro can be obtained by a semi-empirical relationship between the convective turnover time τc and the B-V colour index, but an equivalent activity-rotation correlation seems not to exist for pre-main sequence stars. In this work we report theoretical estimates of τc for low-mass, rotating pre-main sequence stars under either the Full Spectrum of Turbulence (FST) or the classical Mixing Length Theory (MLT) convection models. The results for the MLT models show that the lower the convection efficiency the higher τc, while the FST models give τc lower than those for the MLT. The presence of a parametric magnetic field lowers the convection efficiency, resulting in smaller τc values.

Keywords

Stars: convectionstars: evolutionstars: rotation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 446 - 448
Copyright
Copyright © International Astronomical Union 2007

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