A search for star-planet interactions in the υ Andromedae system at X-ray and optical wavelengths K. Poppenhaeger, L. F. Lenz, A. Reiners, J. H. M. M. Schmitt and E. Shkolnik A&A, 528 (2011) A58 Published online: 01 March 2011 DOI: 10.1051/0004-6361/201016008