Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..30w&link_type=abstract
Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,
Physics
Scientific paper
After the detection of anti-solar differential rotation on giant stars (i.e. the pole spinning faster than the equator, see e.g. Strassmeier et al. 2003), theoretical considerations have shown that such a behaviour can be caused by strong pole-ward meridional flows (Kitchatinov and Ruediger 2004). Using time-series Doppler imaging to reconstruct the change of spot patterns on active stars, one can not only reconstruct differential rotation, but also latitudinal movements of the reconstructed surface features. But due to the lower accuracy of the latitudes of the reconstructed spot features, the data requirements are higher than for the detection of differential rotation. Using a sample of giant stars with know estimates of the differential rotation, we searched for latitudinal changes of the spot patterns in the reconstructed images. Using averaged latitudinal cross-correlation maps, we derived estimates for the magnitudes of the meridional flow the available stars. Plotting the differential rotation values against the meridional flow, one can see a trend towards poleward larger meridional flow for larger anit-solar differential rotation rates, although the number of measurements and the corresponding error bars are too large to draw conclusive results. Modern robotic telescope facilities like STELLA are ideally suited to add more data points to this picture in order to see if the above mentioned correlation really holds true.
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