The magnetic field of Betelgeuse: a local dynamo from giant convection cells? M. Aurière, J.-F. Donati, R. Konstantinova-Antova, G. Perrin, P. Petit and T. Roudier A&A, 516 (2010) L2 Published online: 18 June 2010 DOI: 10.1051/0004-6361/201014925