POSTER PAPER 6.04
Tracing the Spot Evolution on the Moderately-rotating K1-giant
Sigma Geminorum
K. G. Strassmeier, Zs. Kovari, A. Washuettl, M. Weber, J. B. Rice, J. Bartus
Institute: Astrophysical Institute Potsdam (AIP), Germany
Institute: Konkoly Observatory, Budapest, Hungary
Institute: Brandon University, Canada
Contact Email: kstrassmeier@aip.de
Abstract:
We present a simultaneous photometric and spectroscopic imaging analysis
of the long-period RS CVn binary Sigma Gem, covering 3.6 consecutive
rotation cycles with high time resolution. From six overlapping but
consecutive Doppler maps we trace the evolution of
individual spots throughout the time range covered. All spots group either
along a band at approximately +45 degrees latitude and a width of
30 degrees, or appear centered at the equator. No polar spot is detected.
We did not find a conclusive migration pattern from the cross-correlation
maps from one rotation to the next and attribute this to a masking effect of
short-term spot changes.
Index Keywords: Doppler Imaging; Starspots; Stellar Rotation; Activity
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Manuscript submitted: 2001-Aug-10
"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.