POSTER PAPER 8.06
MUSICOS Observations of the Chromospherically Active Binary Star EI Eridani
A. Washuettl, K. G. Strassmeier, B. Foing, and the MUSICOS98 team
Institute: Astrophysical Institute Potsdam (AIP), Germany
Institute: ESTEC/ESA, The Netherlands
Contact Email: kstrassmeier@aip.de
Abstract:
We present first results on spectroscopic observations of the
rapidly-rotating active binary star EI Eridani obtained during
the MUSICOS multi-site campaign in 1998. Eight sites around
the globe were involved in order to achieve surface images
within a few rotations as EI Eridani's critical rotation
period of 1.945 days makes it impossible to obtain
time-resolved images from a single site.
The data were split into groups in order to obtain
consecutive, independent Doppler images.
The preliminary results confirm the existence of a stable polar
spot that changes in size and shape while low-latitute spots are
found to be short lived. For the first time, it is possible to
achieve consecutive, time-resolved Doppler images for EI Eridani.
A preliminary investigation of differential rotation contradicts
the results from Hatzes & Vogt (1992).
Index Keywords: EI Eridani; HD 26337
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Manuscript submitted: 2001-Sep-03
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.