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

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

2008-11-03

arxiv.org/abs/0811.0348v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, 1 table, proceedings of Cool Stars 15, St Andrews, July 2008, to be published in the Conference Proceeding

Scientific paper

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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