First detection of a magnetic field in the fast rotating runaway Oe star zeta Ophiuchi

Abstract

The star zeta Ophiuchi is one of the brightest massive stars in the northern hemisphere and was intensively studied in various wavelength domains. The currently available observational material suggests that certain observed phenomena are related to the presence of a magnetic field. We acquired spectropolarimetric observations of zeta Oph with FORS1 mounted on the 8-m Kueyen telescope of the VLT to investigate if a magnetic field is indeed present in this star. Using all available absorption lines, we detect a mean longitudinal magnetic field B_z_all = 141+-45G, confirming the magnetic nature of this star. We review the X-ray properties of zeta Oph with the aim to understand whether the X-ray emission of zeta Oph is dominated by magnetic or by wind instability processes.

6 pages, 5 figures, accepted for publication in Astronomische Nachrichten

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• Non-thermal processes in bowshocks of runaway stars. Application to Zeta Oph
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• AE Aurigae: first detection of non-thermal X-ray emission from a bow shock produced by a runaway star
• X-ray diagnostics of massive star winds
• New multiwavelength observations of the Of?p star CPD -28 2561
• Modeling non-thermal emission from stellar bow shocks
• The first spectropolarimetric monitoring of the peculiar O4Ief supergiant zeta Puppis
• Widespread subsonic turbulence in Ophiuchus North 1
• Polarization position angle standard stars: a reassessment of $\theta$ and its variability for seventeen stars based on a decade of observations
• Chemical fingerprints of binary mass transfer in massive stars