Surface differential rotation of IL Hya from time-series Doppler images

We present a time-series Doppler imaging study of the K-sibgiant conlponent in the RS CVn-type binary system IL Hya (P-orb =12.905 (1). From re-processing the unique long-tern spectroscopic dataset of 70dys taken in 1996/97. we perform a thorough (ross-correlation analysis to derive surface differential rotation. As a result we get solar-type differential rotation with a shear value alpha of 0.05. in agreement with preliminary suggestions from previous attempts. A possible surface pattern of meridional circulation is also detected.