Rapid Rotation, Active Nests of Convection and Global-scale Flows in Solar-like Stars

Details Rapid Rotation, Active Nests of Convection and Global-scale Flows in Solar-like Stars Rapid Rotation, Active Nests of Convection and Global-scale Flows in Solar-like Stars

2008-01-10

arxiv.org/abs/0801.1672v1

Astron.Nachr.328:1002-1005,2007

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. Presentation at AIP 5th Potsdam Thinkshop, June 24-29 2007. Published in Astr. Nachr. Dec 2007

Scientific paper

10.1002/asna.200710843

In the solar convection zone, rotation couples with intensely turbulent convection to build global-scale flows of differential rotation and meridional circulation. Our sun must have rotated more rapidly in its past, as is suggested by observations of many rapidly rotating young solar-type stars. Here we explore the effects of more rapid rotation on the patterns of convection in such stars and the global-scale flows which are self-consistently established. The convection in these systems is richly time dependent and in our most rapidly rotating suns a striking pattern of spatially localized convection emerges. Convection near the equator in these systems is dominated by one or two patches of locally enhanced convection, with nearly quiescent streaming flow in between at the highest rotation rates. These active nests of convection maintain a strong differential rotation despite their small size. The structure of differential rotation is similar in all of our more rapidly rotating suns, with fast equators and slower poles. We find that the total shear in differential rotation, as measured by latitudinal angular velocity contrast, Delta_Omega, increases with more rapid rotation while the relative shear, Delta_Omega/Omega, decreases. In contrast, at more rapid rotation the meridional circulations decrease in both energy and peak velocities and break into multiple cells of circulation in both radius and latitude.

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