tokens: Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, jointly operated by the Max-Planck-Institut für Astronomie Heidelberg and the Instituto de Astrofísica de Andalucía (CSIC). Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Instituto Nazionale di Astrofisica); and with he Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden; and with the Mercator Telescope, operated on the island of La Palma by the Flemish Community (obtained with the HERMES spectrograph, which is supported by the Fund for Scientific Research of Flanders (FWO), Belgium , the Research Council of K.U.Leuven, Belgium, the Fonds National Recherches Scientific (FNRS), Belgium, the Royal Observatory of Belgium, the Observatoire de Genève, Switzerland and the Thüringer Landessternwarte Tautenburg, Germany), all operated at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. This work was supported by the Spanish Ministerio de Educación y Ciencia (MEC) under grant AYA2005-02750, Ministerio de Ciencia e Innovación (MICINN) under grant AYA2008-06423-C03-03, AstroMadrid S2009/ESP-1496. M. Hernán-Obispo wants to especially thanks to P. Figueira and M. Marmier for their availability to help and for providing us with the CORALIE data used in the activity study and the information requested. M. C. Gálvez-Ortiz acknowledges financial support by the Spanish MICINN under the Consolider-Ingenio 2010 Program grant CSD2006-00070: first Science with the GTC ( http://www.iac.es/consolider-ingenio-gtc ). She also acknowledges the support of a JAE-Doc CSIC fellowship co-funded with the European Social Fund under the program “Junta para la Ampliación de Estudios” . Financial support was also provided by the Spanish Ministerio de Ciencia e Innovación and Ministerio de Economía y Competitividad under AyA2011- 30147-C03-03 grant. M. Tuomi, J. R. Barnes, M. C. Gálvez-Ortiz and D. J. Pinfield acknowledge support from RoPACS during this research, a Marie Curie Initial Training Network funded by the European Commissions Seventh Framework Programme. J. S. Jenkins acknowledges funding from CATA (PB06, Conicyt). We want also to thanks Saskia Prins for her help in Mercator observations and HERMES pipeline members (L. Dumortier, Y. Fremat, H. Hensberge, A. Jorissen, S. Van Eck, H. Van Wickel) for their help in the data reduction. M. Hernán-Obispo thanks Sito Recuero for his help improving the Fig. 18. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. The authors are grateful to an anonymous referee for valuable comments and suggestions which have helped improve this paper.
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