[en] The B fields in OB stars (BOB) survey is an ESO Large Programme collecting spectropolarimetric observations for a large number of early-type stars in order to study the occurrence rate, properties, and ultimately the origin of magnetic fields in massive stars. A total of 98 objects was observed over 20 nights with FORS2 and HARPSpol to July 2014. Preliminary results indicate that the fraction of magnetic OB stars with an organised, detectable field is low. This conclusion, now independently reached by two different surveys, has profound implications for any theoretical model attempting to explain the field formation in these stars. We also discuss some important issues addressed by our observations (e.g., the lower bound of the field strength) and the discovery of some remarkable objects.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Morel, Thierry ; Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Castro, N.
Fossati, L.
Hubrig, S.
Langer, N.
Przybilla, N.
Schöller, M.
Carroll, T.
Ilyin, I.
Irrgang, A.
Oskinova, L.
Schneider, F. R. N.
Díaz, S. S.
Briquet, Maryline ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
