Chromospheric activity of stars with planets B. L. Canto Martins, M. L. das Chagas, S. Alves, I. C. Leão, L. P. de Souza Neto and J. R. de Medeiros A&A, 530 (2011) A73 Published online: 12 May 2011 DOI: 10.1051/0004-6361/201015314