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'Negative' surface differential rotation in stars having low Coriolis numbers (slow rotation or high turbulence)

Authors Chan, Kwing L.
Issue Date 2009
Source Proceedings of the International Astronomical Union , v. 5, (264), 2009, p. 219-221
Summary A general picture of differential rotation in cool stars is that they are 'solar-like', with the equator spinning faster than the poles. Such surface differential rotation profiles have also been demonstrated by some three-dimensional simulations. In our numerical investigation of rotating convection (both regional and global), we found that this picture is not universally applicable. The equator may spin substantially slower than the poles (Omega equator - Omega pole)/Omega can reach 50%). The key parameter that determines the transition in behavior is the Coriolis number (inverse Rossby number). 'Negative' differential rotation of the equator (relative to the mean rotation) occurs if the Coriolis number is below a critical value.
ISSN 1743-9213
ISBN 978-0-521-76492-6
Rights Copyright © International Astronomical Union 2010
Language English
Format Conference paper
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