Magnetic activity on V889 Herculis - Combining photometry and spectroscopy S. P. Järvinen, H. Korhonen, S. V. Berdyugina, I. Ilyin, K. G. Strassmeier, M. Weber, I. Savanov and I. Tuominen A&A, 488 3 (2008) 1047-1055 Published online: 17 July 2008 DOI: 10.1051/0004-6361:200809837