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

摘要

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