Article (Scientific journals)
Discovery of a magnetic field in the CoRoT hybrid B-type pulsator HD 43317
Briquet, Maryline; Neiner, C.; Leroy, B. et al.
2013In Astronomy and Astrophysics, 557, p. 16
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Keywords :
stars: magnetic field; stars: individual: HD 43317
Abstract :
[en] Context. A promising way of testing the impact of a magnetic field on internal mixing (core overshooting, internal rotation) in main-sequence B-type stars is to perform asteroseismic studies of a sample of magnetic pulsators. <BR /> Aims: The CoRoT satellite revealed that the B3IV star HD 43317 is a hybrid SPB/β Cep-type pulsator that has a wealth of pulsational constraints on which one can perform a seismic modelling, in particular, probing the extent of its convective core and mixing processes. Moreover, indirect indicators of a magnetic field in the star were observed: rotational modulation due to chemical or temperature spots and X-ray emission. Our goal was to directly investigate the field in HD 43317 and, if it is magnetic, to characterise it. <BR /> Methods: We collected data with the Narval spectropolarimeter installed at Télescope Bernard Lyot (TBL, Pic du Midi, France) and applied the least-squares deconvolution technique to measure the circular polarisation of the light emitted from HD 43317. We modelled the longitudinal field measurements directly with a dipole. <BR /> Results: Zeeman signatures in the Stokes V profiles of HD 43317 are clearly detected and rotationally modulated, which proves that this star exhibits an oblique magnetic field. The modulation with the rotation period deduced from the CoRoT light curve is also confirmed, and we found a field strength at the poles of about 1 kG. Our result must be taken into account in future seismic modelling work of this star. Based on observations obtained using the Narval spectropolarimeter at the Observatoire du Pic du Midi (France), which is operated by the Institut National des Sciences de l'Univers (INSU).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Briquet, Maryline ;  Université de Liège - ULiège
Neiner, C.;  LESIA, Observatoire de Paris, CNRS UMR 8109, UPMC, Univ. Paris Diderot, 5 place Jules Janssen, 92195, Meudon Cedex, France
Leroy, B.
Papics, P.
Language :
English
Title :
Discovery of a magnetic field in the CoRoT hybrid B-type pulsator HD 43317
Publication date :
01 September 2013
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
557
Pages :
L16
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 October 2013

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