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tokens: The authors would like to thank the referee, John Landstreet, for useful comments that improved the manuscript. L.F. acknowledges financial support from the Alexander von Humboldt Foundation. T.M. acknowledges financial support from Belspo for contract PRODEX GAIA-DPAC. N.L. and A.R. acknowledge financial support from the DFG-CONICYT International Collaboration Project (DFG-06). S.S.-D. acknowledges funding by the Spanish Ministry of Economy and Competitiviness under the grants AYA2010-21697-C05-05, AYA2012-39364-C02-01, and Severo Ochoa SEV-2011-0187, and by the Canary Islands Governments under grant PID2010119. L.F. is greatly in debt to Oleg Kochukhov for providing most of the tools used here for reducing and analysing the HARPSpol data. L.F. also thanks Gregg Wade, John Landstreet, and Coralie Neiner for fruitful discussions. The authors thank Andreas Irrgang, Ignacio Negueruela, Henk Spruit, Gautier Mathys, and Alexander Kholtygin for useful comments. S.H. and M.S. thank Thomas Szeifert for providing the pipeline for the FORS spectra extraction.