Detection of magnetic field in the B2 star ρ Ophiuchi A with ESO FORS2 I. Pillitteri, L. Fossati, N. Castro Rodriguez, L. Oskinova and S. J. Wolk A&A, 610 (2018) L3 Published online: 13 February 2018 DOI: 10.1051/0004-6361/201732078