Doppler maps and surface differential rotation of EI Eri from the MUSICOS 1998 observations

We present time‐series Doppler images of the rapidly‐rotating active binary star EI Eri from spectroscopic observations collected during the MUSICOS multi‐site campaign in 1998, since the critical rotation period of 1.947 days makes it impossible to obtain time‐resolved images from a single site. From the surface reconstructions a weak solar‐type differential rotation, as well as a tiny poleward meridional flow are measured.