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Fig. 7

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a) The ratio indicates the amount of differential rotation and is plotted here vs. effective temperature Teff. Dotted lines indicate the range of for rigid body rotation and unknown limb darkening. The solid line denotes for the case of rigid rotation and Sun-like limb darkening (ε = 0.6). Symbol size scales with projected rotational velocity vsini as in Fig. 5. Open circles denote rigid rotators and filled circles differential rotators. The triangles show the cases where the low fraction of is probably caused by gravitational darkening. The data point with lowest represents HD 104731 which displays the strongest relative differential rotation discovered in the present work. The lack of differential rotators at early-F types can be spotted easily. b) 2σ confidence limit on the fraction of differential rotation with respect to effective temperature. Only bins with a number of at least 15 objects are displayed.

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