A&A 574, A90 (2015) Astronomy DOI: 10.1051/0004-6361/201424579 & c ESO 2015 Astrophysics The magnetic fields at the surface of active single G-K giants, M. Aurière1,2, R. Konstantinova-Antova3,1 , C. Charbonnel4,2,G.A.Wade5, S. Tsvetkova3, P. Petit1,2, B. Dintrans1,2, N. A. Drake6,7, T. Decressin8,4,N.Lagarde9, J.-F. Donati1,2, T. Roudier1,2, F. Lignières1,2, K.-P. Schröder10, J. D. Landstreet11,12,A.Lèbre13,W.W.Weiss14, and J.-P. Zahn15 1 Université de Toulouse, UPS-OMP, Institut de Recherche en Astrophysique et Planétologie, Toulouse, France
[email protected] 2 CNRS, UMR 5277, Institut de Recherche en Astrophysique et Planétologie, 14 avenue Édouard Belin, 31400 Toulouse, France 3 Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72 Tsarigradsko shose, 1784 Sofia, Bulgaria 4 Geneva Observatory, University of Geneva, 51 chemin des Maillettes, 1290 Versoix, Switzerland 5 Department of Physics, Royal Military College of Canada, PO Box 17000, Station “Forces”, Kingston, Ontario, K7K 4B4, Canada 6 Sobolev Astronomical Institute, St. Petersburg State University, Universitetski pr. 28, 198504 St. Petersburg, Russia 7 Observatório Nacional/MCTI, Rua José Cristino 77, CEP 20921-400, Rio de Janeiro-RJ, Brazil 8 INAF – Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monte Porzio Catone (RM), Italy 9 School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK 10 Departamento de Astronomia, Universitad de Guanajuato, AP 144, C.P. 36000, GTO, Mexico 11 Physics & Astronomy Department, The University of Western Ontario, London, Ontario, Canada N6A 3K7 12 Armagh Observatory, College Hill, Armagh, BT619DG, Northern Ireland, UK 13 LUPM – UMR 5299 – CNRS and Université Montpellier II – Place E.