TY  - JOUR
A1  - Schöller, Markus
A1  - Hubrig, Swetlana
A1  - Fossati, L.
A1  - Carroll, Thorsten Anthony
A1  - Briquet, Maryline
A1  - Oskinova, Lida
A1  - Järvinen, S.
A1  - Ilyin, Ilya
A1  - Castro, N.
A1  - Morel, T.
A1  - Langer, N.
A1  - Przybilla, N.
A1  - Nieva, M. -F.
A1  - Kholtygin, A. F.
A1  - Sana, H.
A1  - Herrero, A.
A1  - Barba, R. H.
A1  - de Koter, A.
T1  - B fields in OB stars (BOB)
BT  - Concluding the FORS2 observing campaign
JF  - Astronomy and astrophysics : an international weekly journal
N2  - Aims. The B fields in OB stars (BOB) Collaboration is based on an ESO Large Programme to study the occurrence rate, properties, and ultimately the origin of magnetic fields in massive stars. Methods. In the framework of this program, we carried out low-resolution spectropolarimetric observations of a large sample of massive stars using FORS2 installed at the ESO VLT 8m telescope. Results. We determined the magnetic field values with two completely independent reduction and analysis pipelines. Our in-depth study of the magnetic field measurements shows that differences between our two pipelines are usually well within 3 sigma errors. From the 32 observations of 28 OB stars, we were able to monitor the magnetic fields in CPD -57 degrees 3509 and HD164492C, confirm the magnetic field in HD54879, and detect a magnetic field in CPD -62 degrees 2124. We obtain a magnetic field detection rate of 6 +/- 3% for the full sample of 69 OB stars observed with FORS 2 within the BOB program. For the preselected objects with a nu sin i below 60 km s(-1), we obtain a magnetic field detection rate of 5 +/- 5%. We also discuss X-ray properties and multiplicity of the objects in our FORS2 sample with respect to the magnetic field detections.
KW  - polarization
KW  - stars: early-type
KW  - stars: magnetic field
KW  - stars: massive
Y1  - 2017
U6  - https://doi.org/10.1051/0004-6361/201628905
SN  - 1432-0746
VL  - 599
PB  - EDP Sciences
CY  - Les Ulis
ER  -