Measuring differential rotation of the K-giant<i>ζ</i> Andromedae
Measuring differential rotation of the K-giant<i>ζ</i> Andromedae
We investigate the temporal spot evolution of the K-giant component in the RS CVn-type binary system $\zeta$\,Andromedae to establish its surface differential rotation. Doppler imaging is used to study three slightly overlapping spectroscopic datasets, obtained independently at three different observing sites. Each dataset covers one full stellar rotation with good …