Magnetic characterization of the SPB/$\beta$ Cep hybrid pulsator HD 43317

Abstract

Large-scale magnetic fields at the surface of massive stars do not only influence the outer-most layers of the star, but also have consequences for the deep interior, only observationally accessible through asteroseismology. We performed a detailed characterization of the dipolar magnetic field at the surface of the B3.5V star HD 43317, a SPB/$\beta$ Cep hybrid pulsator, by studying the rotationally modulated magnetic field of archival and new Narval spectropolarimetry. Additionally, we employed a grid-based approach to compare the Zeeman signatures with model profiles. By studying the rotational modulation of the He lines in both the Narval and HARPS spectroscopy caused by co-rotating surface abundance inhomogeneities, we updated the rotation period to $0.897673\pm 0.000004$d. The inclination angle between the rotation axis and the observer's line of sight remains ill-defined, because of the low level of variability in Stokes V and deformations in the intensity profiles by stellar pulsation modes. The obliquity angle between the rotation and magnetic axes is constrained to $\beta \in [67,90{]}^{\circ }$, and the strength of the dipolar magnetic field is of the order of 1kG to 1.5kG. This magnetic field at the stellar surface is sufficiently strong to warrant a uniformly rotating radiative envelope, causing less convective core overshooting, which should be visible in future forward seismic modeling.

arXiv comment18 pages, 10 figures, 4 tables, accepted for publication in A&A

References in corpus (37)

• emcee: The MCMC Hammer
• Mass-loss predictions for O and B stars as a function of metallicity
• Dynamical Simulations of Magnetically Channeled Line-Driven Stellar Winds: I. Isothermal, Nonrotating, Radially Driven Flow
• A catalogue of young runaway Hipparcos stars within 3kpc from the Sun
• Internal Gravity Waves in Massive Stars: Angular Momentum Transport
• CLES, Code Liegeois d'Evolution Stellaire
• The MiMeS Survey of Magnetism in Massive Stars: Introduction and overview
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Sub-Inertial Gravity Modes in the B8V Star KIC 7760680 Reveal Moderate Core Overshooting and Low Vertical Diffusive Mixing
• Simulations of core convection in rotating A-type stars: Differential rotation and overshooting
• Signatures of internal rotation discovered in the Kepler data of five slowly pulsating B stars
• Magnetic spots on hot massive stars
• On non-axisymmetric magnetic equilibria in stars
• Transport and mixing in the radiation zones of rotating stars II. Axisymmetric magnetic field
• Characterisation of the magnetic field of the Herbig Be star HD 200775
• Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
• Variability in the CoRoT photometry of three hot O-type stars. HD 46223, HD 46150 and HD 46966
• Detecting non-uniform period spacings in the Kepler photometry of gamma Doradus stars: methodology and case studies
• Gravity Waves in the Sun
• Multisite spectroscopic seismic study of the beta Cep star V2052 Oph: inhibition of mixing by its magnetic field
• Asteroseismic fingerprints of rotation and mixing in the slowly pulsating B8 V star KIC 7760680
• The Observational Signatures of Convectively Excited Internal Gravity Modes in Main Sequence Stars
• HR 5907: Discovery of the most rapidly rotating magnetic B-type star by the MiMeS Collaboration
• The Effect of Magnetic Field Tilt and Divergence on the Mass Flux and Flow Speed in a Line-Driven Stellar Wind
• On the use of the Fourier Transform to determine the projected rotational velocity of line-profile variable B stars
• Impact of rotation on stochastic excitation of gravity and gravito-inertial waves in stars
• Asteroseismology and Oblique Pulsator Model of Beta Cephei
• Kepler sheds new and unprecedented light on the variability of a blue supergiant: gravity waves in the O9.5Iab star HD 188209
• Exploring the photometric signatures of magnetospheres around Helium-strong stars
• Probing the internal magnetic field of slowly pulsating B-stars through g modes
• Discovery of the magnetic field in the pulsating B star beta Cephei
• A multisite photometric study of two unusual Beta Cep stars: the magnetic V2052 Oph and the massive rapid rotator V986 Oph
• Discovery of a magnetic field in the CoRoT hybrid B-type pulsator HD 43317
• Magnetic field topology and chemical spot distributions in the extreme Ap star HD 75049
• Three-dimensional abundance distributions in ApBp star atmospheres: non-axisymmetric magnetic geometry
• The SpaceInn-SISMA database: characterization of a large sample of variable and active stars by means of HARPS spectra
• Visibility of unstable oscillation modes in a rapidly rotating B star

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• The Magnetic Early B-type Stars II: stellar atmospheric parameters in the era of Gaia
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