Differential rotation in fully convective stars
Differential rotation in fully convective stars
复制标题
全对流恒星中的差分旋转
DOI:
10.1111/j.1365-2966.2010.16380.x
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发表时间:
2010
影响因子:
4.8
通讯作者:
Balbus S
中科院分区:
文献类型:
--
作者:
Balbus S
Under the assumption of thermal wind balance and effective entropy mixing in constant rotation surfaces, the isorotational contours of the solar convective zone may be reproduced with great fidelity. Even at this early stage of development, this helioseismology fit may be used to put a lower bound on the mid-latituderadialsolar entropy gradient, which is in good accord with standard mixing length theory. In this paper, we generalize this solar calculation to fully convective stars (and potentially planets), retaining the assumptions of thermal wind balance and effective entropy mixing in isorotational surfaces. It is found that each isorotation contour is of the formR2=A+BΦ(r), whereRis the radius from the rotation axis, Φ(r) is the (assumed spherical) gravitational potential, andAandBare constants along the contour. This result is applied to simple models of fully convective stars. Both solar-like surface rotation profiles (angular velocity decreasing toward the poles) as well as ‘antisolar’ profiles (angular velocity increasing toward the poles) are modelled; the latter bear some suggestive resemblance to numerical simulations. We also perform exploratory studies of zonal surface flows similar to those seen in Jupiter and Saturn. In addition to providing a practical framework for understanding the results of large-scale numerical simulations, our findings may also prove useful in dynamical calculations for which a simple but viable model for the background rotation profile in a convecting fluid is needed. Finally, our work bears directly on an important goal of the CoRoT programme: to elucidate the internal structure of rotating, convecting stars.
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DOI:
10.1111/j.1365-2966.2009.15464.x
发表时间:
2009-07
影响因子:
4.8
作者:
S. Balbus;S. Balbus;Julius Bonart;H. Latter;N. Weiss
通讯作者:
S. Balbus;S. Balbus;Julius Bonart;H. Latter;N. Weiss
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
J. Aurnou;M. Heimpel
通讯作者:
M. Heimpel
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
G. Horedt
通讯作者:
G. Horedt
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
S. Balbus
通讯作者:
S. Balbus
影响因子:
6.5
作者:
Brun, A. S.;Antia, H. M.;Chitre, S. M.
通讯作者:
Chitre, S. M.