B fields in OB stars (BOB): Concluding the FORS 2 observing campaign

Polarization; Stars: early-type; Stars: magnetic field; Stars: massive; Magnetic fields; Magnetism; Pipelines; B-fields; In-depth study; Low resolution; Massive stars; X-ray properties; Stars

Abstract :

[en] 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 FORS 2 installed at the ESO VLT 8 m 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 3σ errors. From the 32 observations of 28 OB stars, we were able to monitor the magnetic fields in CPD -57° 3509 and HD 164492C, confirm the magnetic field in HD 54879, and detect a magnetic field in CPD -62° 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 v 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 FORS 2 sample with respect to the magnetic field detections. © ESO, 2017.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Schöller, M.; European Southern Observatory, Karl-Schwarzschild-Str. 2, Garching, Germany

Hubrig, S.; Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany

Fossati, L.; Österreichische Akademie der Wissenschaften, Institut für Weltraumforschung, Schmiedlstraße 6, Graz, Austria, Argelander-Institut für Astronomie der Universität Bonn, Auf dem Hügel 71, Bonn, Germany

Carroll, T. A.; Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany

Briquet, Maryline ; Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany, Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Quartier Agora, Allée du 6 Août 19c, Bât. B5C, Liège, Belgium

Oskinova, L. M.; Universität Potsdam, Institut für Physik und Astronomie, Karl-Liebknecht-Str. 24/25, Potsdam, Germany

Järvinen, S.; Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany

Ilyin, I.; Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany

Castro, N.; Argelander-Institut für Astronomie der Universität Bonn, Auf dem Hügel 71, Bonn, Germany, Department of Astronomy, University of Michigan, 1085 S. University Avenue, Ann Arbor, MI, United States

Morel, Thierry ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie

More authors (8 more)

Language :

English

Title :

B fields in OB stars (BOB): Concluding the FORS 2 observing campaign

Publication date :

2017

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

599

Pages :

A66

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

Belspo for contract PRODEX Gaia-DPAC; Meitner Fellowship under project number N-1868-NBL

Funders :

AvH - Alexander von Humboldt-Stiftung
RFBR - Russian Foundation for Basic Research
BELSPO - Politique scientifique fédérale
FWF - Austrian Science Fund

Available on ORBi :

since 16 October 2018

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