Tracing the Spot Evolution on the Moderately-Rotating K1-Giant σ Geminorum

Details Tracing the Spot Evolution on the Moderately-Rotating K1-Giant σ Geminorum Tracing the Spot Evolution on the Moderately-Rotating K1-Giant σ Geminorum

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..927s&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

Doppler Imaging, Starspots, Stellar Rotation, Activity

Scientific paper

We present a simultaneous photometric and spectroscopic imaging analysis of the long-period RS CVn binary σ 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 ° latitude and a width of 30 °, 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.

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