Volume 373, Number 1, July I 2001
|Page(s)||199 - 210|
|Section||Interstellar and circumstellar matter|
|Published online||15 July 2001|
Doppler imaging of stellar surface structure
XVI. A time-series analysis of the moderately-rotating K1-giant σ Geminorum
Konkoly Observatory of the Hungarian Academy of Sciences, 1525 Budapest, Hungary e-mail: email@example.com; firstname.lastname@example.org
2 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: kstrassmeier, wasi, email@example.com
3 Department of Physics, Brandon University, Brandon, Manitoba R7A 6A9, Canada e-mail: rice@BrandonU.ca
Corresponding author: K. G. Strassmeier, firstname.lastname@example.org
Accepted: 24 April 2001
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.
Key words: stars: activity / stars: imaging / stars: individual: σ Gem / stars: late-type / starspots
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.