Magnetic field structure in single late-type giants: the effectively single giant V390 Aurigae R. Konstantinova-Antova, M. Aurière, P. Petit, C. Charbonnel, S. Tsvetkova, A. Lèbre and R. Bogdanovski A&A, 541 (2012) A44 Published online: 26 April 2012 DOI: 10.1051/0004-6361/201116690