The magnetic field of ζ Orionis A
作者： A. Blazère , C. Neiner , A. Tkachenko , J.-C. Bouret , Th. Rivinius
DOI: 10.1051/0004-6361/201526855
关键词:
摘要: Context. zeta Ori A is a hot star claimed to host weak magnetic field, but no clear detection was obtained so far. In addition, it recently shown be binary system composed of O9.5I supergiant and B1IV star. Aims. We aim at verifying the presence field in A, identifying which two components belongs (or whether both stars are magnetic), characterizing field. Methods. Very high signal-to-noise spectropolarimetric data were with Narval Bernard Lyot Telescope (TBL) France. Archival HEROS, FEROS UVES spectroscopic also used. The first disentangled separate components. then analyzed them least-squares deconvolution technique extract information. Results. confirm that magnetic. find component Aa component: Zeeman signatures observed rotational modulation longitudinal clearly detected period 6.829 d. This only O known as today. With an oblique dipole model Stokes V profiles, we show polar strength similar 140 G. Because stellar wind strong, does not centrifugally supported magnetosphere. It may dynamical Its companion Ab any signature, upper limit on undetected 300
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