Abstract
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. As of July 2014, a total of 98 objects were
observed over 20 nights with FORS2 and HARPSpol. Our 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 objects. We discuss in this contribution
some important issues addressed by our observations (e.g., the lower bound of
the field strength) and the discovery of some remarkable objects.
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