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We continue our studies on stellar latitudinal differential rotation. Thepresented work is a sequel of the work of Reiners et al. who studied thespectral line broadening profile of hundreds of stars of spectral types Athrough G at high rotational speed (vsini > 12 km/s). While most stars werefound to be rigid rotators, only a few tens show the signatures of differentialrotation. The present work comprises the rotational study of some 180additional stars. The overall broadening profile is derived according toReiners et al. from hundreds of spectral lines by least-squares deconvolution,reducing spectral noise to a minimum. Projected rotational velocities vsini aremeasured for about 120 of the sample stars. Differential rotation produces acuspy line shape which is best measured in inverse wavelength space by thefirst two zeros of its Fourier transform. Rigid and differential rotation canbe distinguished for more than 50 rapid rotators (vsini > 12 km/s) among thesample stars from the available spectra. Ten stars with significantdifferential rotation rates of 10-54 % are identified, which add to the fewknown rapid differential rotators. Differential rotation measurements of 6 %and less for four of our targets are probably spurious and below the detectionlimit. Including these objects, the line shapes of more than 40 stars areconsistent with rigid rotation.

Rotation and differential rotation in rapidly rotating field stars