First HARPSpol discoveries of magnetic fields in massive stars

Abstract

In the framework of the Magnetism in Massive Stars (MiMeS) project, a HARPSpol Large Program at the 3.6m-ESO telescope has recently started to collect high-resolution spectropolarimetric data of a large number of Southern massive OB stars in the field of the Galaxy and in many young clusters and associations. In this Letter, we report on the first discoveries of magnetic fields in two massive stars with HARPSpol - HD 130807 and HD 122451, and confirm the presence of a magnetic field at the surface of HD 105382 that was previously observed with a low spectral resolution device. The longitudinal magnetic field measurements are strongly varying for HD 130807 from $\sim$-100 G to $\sim$700 G. Those of HD 122451 and HD 105382 are less variable with values ranging from $\sim$-40 to -80 G, and from $\sim$-300 to -600 G, respectively. The discovery and confirmation of three new magnetic massive stars, including at least two He-weak stars, is an important contribution to one of the MiMeS objectives: the understanding of origin of magnetic fields in massive stars and their impacts on stellar structure and evolution.

4 pages, 2 figures, accepted for publication in A&A Letter

References in corpus (7)

• Evolutionary state of magnetic chemically peculiar stars
• Characterisation of the magnetic field of the Herbig Be star HD 200775
• HR 5907: Discovery of the most rapidly rotating magnetic B-type star by the MiMeS Collaboration
• Evolution of magnetic fields in stars across the upper main sequence: I. Catalogue of magnetic field measurements with FORS1 at the VLT
• High-precision elements of double-lined spectroscopic binaries from combined interferometry and spectroscopy. Application to the beta Cephei star beta Centauri
• Discovery of magnetic fields in three He variable Bp stars with He and Si spots
• The MiMeS Project: Magnetism in Massive Stars

Cited by in corpus (27)

• A Magnetic Confinement vs. Rotation Classification of Massive-Star Magnetospheres
• The MiMeS Survey of Magnetism in Massive Stars: Introduction and overview
• The Magnetic Early B-type Stars III: A main sequence magnetic, rotational, and magnetospheric biography
• The Magnetic Early B-type Stars I: Magnetometry and Rotation
• Multisite spectroscopic seismic study of the beta Cep star V2052 Oph: inhibition of mixing by its magnetic field
• The magnetic fields of intermediate-mass T Tauri stars : I. Magnetic detections and fundamental stellar parameters
• The surface nitrogen abundance of a massive star in relation to its oscillations, rotation, and magnetic field
• MOBSTER -- VI. The crucial influence of rotation on the radio magnetospheres of hot stars
• On the use of the Fourier Transform to determine the projected rotational velocity of line-profile variable B stars
• Denoising spectroscopic data by means of the improved Least-Squares Deconvolution method
• Massive pulsating stars observed by BRITE-Constellation. I. The triple system Beta Centauri (Agena)
• Spectroscopic evolution of massive stars on the main sequence
• Discovery of new magnetic early-B stars within the MiMeS HARPSpol survey
• The Magnetic Early B-type Stars II: stellar atmospheric parameters in the era of Gaia
• A new type of X-ray pulsar
• Detectability of small-scale magnetic fields in early-type stars
• The pulsating magnetosphere of the extremely slowly rotating magnetic $\beta$ Cep star ${\xi }^1$ CMa
• Detection of magnetic fields in chemically peculiar stars observed with the K2 space mission
• HD 164492C: a rapidly-rotating, H$\alpha$-bright, magnetic early B star associated with a 12.5d spectroscopic binary
• X-ray diagnostics of massive star winds
• Discovery of a magnetic field in the early B-type star sigma Lupi
• Weak magnetic field, solid-envelope rotation, and wave-induced N-enrichment in the SPB star $\zeta$ Cassiopeiae
• Space Photometry with BRITE-Constellation
• On X-ray pulsations in beta Cephei-type variables
• Magnetic characterization and variability study of the magnetic SPB star o Lup
• Faraday Rotation Distributions from Stellar Magnetism in Wind-Blown Bubbles
• Magneto-asteroseismology of massive magnetic pulsators