Article (Scientific journals)
B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD -62° 2124
Castro, N.; Fossati, L.; Hubrig, S. et al.
2017In Astronomy and Astrophysics, 597, p. 6
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Keywords :
Stars: Atmospheres; Stars: Evolution; Stars: Individual: CPD-62 2124; Stars: Magnetic field; Stars: Massive; Cosmology; Magnetic fields; Magnetism; Magnetosphere; Stars: atmosphere; Stars: individual; Stars
Abstract :
[en] The origin and evolution of magnetism in OB stars is far from being well understood. With approximately 70 magnetic OB stars known, any new object with unusual characteristics may turn out to be a key piece of the puzzle. We report the detection of an exceptionally strong magnetic field in the He-strong B2IV star CPD -62° 2124. Spectropolarimetric FORS2 and HARPSpol observations were analysed by two independent teams and procedures, concluding on a strong longitudinal magnetic field of approximately 5.2kG. The quantitative characterisation of the stellar atmosphere yields an effective temperature of 23 650 ± 250 K, a surface gravity of 3.95 ± 0.10 dex and a surface helium fraction of 0.35 ± 0.02 by number. The metal composition is in agreement with the cosmic abundance standard, except for Mg, Si and S, which are slightly non-solar. The strong and broad (300 km s-1) disc-like emission displayed by the Ha line suggests a centrifugal magnetosphere supported by the strong magnetic field. Our results imply that CPD -62° 2124 is an early B-type star hosting one of the strongest magnetic fields discovered to date, and one of the most evolved He-strong stars known, with a fractional main-sequence lifetime of approximately 0.6. © ESO 2017.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Castro, N.;  Department of Astronomy, University of Michigan, 1085 S. University Avenue, Ann Arbor, MI, United States, Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, Bonn, Germany
Fossati, L.;  Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, Bonn, Germany, Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, Graz, Austria
Hubrig, S.;  Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany
Järvinen, S. P.;  Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany
Przybilla, N.;  Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany
Nieva, M.-F.;  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
Carroll, T. A.;  Institut für Astro- und Teilchenphysik, Universität Innsbruck, Technikerstr. 25/8, Innsbruck, Austria
Schöller, M.;  European Southern Observatory, Karl-Schwarzschild-Str. 2, Garching bei München, Germany
Langer, N.;  Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, Bonn, Germany
Schneider, F. R. N.;  Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, United Kingdom
Simón-Díaz, S.;  Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain, Universidad de La Laguna, La Laguna, Tenerife, Spain
Morel, Thierry  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Butler, K.;  Universitäts-Sternwarte München, Scheinerstr. 1, München, Germany
More authors (4 more) Less
Language :
English
Title :
B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD -62° 2124
Publication date :
2017
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
597
Pages :
L6
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Meitner Fellowship under project number N-1868-NBL; BELSPO contract PRODEX Gaia-DPAC
Funders :
AvH - Alexander von Humboldt-Stiftung [DE]
FWF - Austrian Science Fund [AT]
BELSPO - Politique scientifique fédérale [BE]
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