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The B Fields in OB Stars (BOB) Survey

Published online by Cambridge University Press:  23 January 2015

T. Morel ,
N. Castro ,
L. Fossati ,
S. Hubrig ,
N. Langer ,
N. Przybilla ,
M. Schöller ,
T. Carroll ,
I. Ilyin  and
A. Irrgang
...Show all authors
T. Morel
Affiliation:
Institut d'Astrophysique et de Géophysique, Liège, Belgium
N. Castro
Affiliation:
Argelander-Institut für Astronomie, Bonn, Germany
L. Fossati
Affiliation:
Argelander-Institut für Astronomie, Bonn, Germany
S. Hubrig
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), Potsdam, Germany
N. Langer
Affiliation:
Argelander-Institut für Astronomie, Bonn, Germany
N. Przybilla
Affiliation:
Institute for Astro- and Particle Physics, University of Innsbruck, Austria
M. Schöller
Affiliation:
European Southern Observatory, Garching, Germany
T. Carroll
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), Potsdam, Germany
I. Ilyin
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), Potsdam, Germany
A. Irrgang
Affiliation:
Dr. Remeis Observatory & ECAP, Bamberg, Germany
L. Oskinova
Affiliation:
Institut für Physik und Astronomie der Universität Potsdam, Germany
F. R. N. Schneider
Affiliation:
Argelander-Institut für Astronomie, Bonn, Germany
S. Simon Díaz
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Spain Universidad de La Laguna, Dpto. de Astrofísica, La Laguna, Spain
M. Briquet
Affiliation:
Institut d'Astrophysique et de Géophysique, Liège, Belgium
J. F. González
Affiliation:
Instituto de Ciencias Astronomicas, de la Tierra, y del Espacio, San Juan, Argentina
N. Kharchenko
Affiliation:
Main Astronomical Observatory, Kiev, Ukraine
M.-F. Nieva
Affiliation:
Institute for Astro- and Particle Physics, University of Innsbruck, Austria Dr. Remeis Observatory & ECAP, Bamberg, Germany
R.-D. Scholz
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), Potsdam, Germany
A. de Koter
Affiliation:
Astronomical Institute Anton Pannekoek, Amsterdam, The Netherlands Instituut voor Sterrenkunde, Universiteit Leuven, Leuven, Belgium
W.-R. Hamann
Affiliation:
Institut für Physik und Astronomie der Universität Potsdam, Germany
A. Herrero
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Spain Universidad de La Laguna, Dpto. de Astrofísica, La Laguna, Spain
J. Maíz Apellániz
Affiliation:
Instituto de Astrofísica de Andalucía-CSIC, Granada, Spain
H. Sana
Affiliation:
ESA/Space Telescope Science Institute, Baltimore, USA
R. Arlt
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), Potsdam, Germany
R. Barbá
Affiliation:
Departamento de Física, La Serena, Chile
P. Dufton
Affiliation:
Astrophysics Research Centre, Belfast, UK
A. Kholtygin
Affiliation:
Chair of Astronomy, Saint-Petersburg State University, Russia
G. Mathys
Affiliation:
European Southern Observatory, Santiago, Chile
A. Piskunov
Affiliation:
Institute of Astronomy of the Russian Acad. Sci., Moscow, Russia
A. Reisenegger
Affiliation:
Pontificia Universidad Católica de Chile, Santiago, Chile
H. Spruit
Affiliation:
Max-Planck-Institut für Astrophysik, Garching, Germany
S.-C. Yoon
Affiliation:
Department of Physics and Astronomy, Seoul National University, Seoul, Republic of Korea
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Abstract

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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.

Keywords

magnetic fieldsstars: early-typestars: magnetic fieldsstars: individual (HD 164492C, CPD –57° 3509, HD 54879, β CMa, ϵ CMa)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 342 - 347
Copyright
Copyright © International Astronomical Union 2015 

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