ar X iv : 0 81 1 . 03 48 v 1 [ as tr o - ph ] 3 N ov 2 00 8 Doppler maps and surface differential rotation of EI Eri from the MUSICOS 1998 observations
نویسندگان
چکیده
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.
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تاریخ انتشار 2008