B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD -62° 2124

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

More authors (4 more)

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 :

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
FWF - Austrian Science Fund
BELSPO - Politique scientifique fédérale

Available on ORBi :

since 16 October 2018

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