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Magnetic Doppler Imaging of He-strong star HD 184927

We have employed an extensive new timeseries of Stokes I and V spectra obtained with the ESPaDOnS spectropolarimeter at the 3.6-m Canada-France-Hawaii Telescope to investigate the physical parameters, chemical abundance distributions and magnetic field topology of the slowly-rotating He-strong star HD 184927. We infer a rotation period of 9.53071+-0.00120 from H-alpha, H-beta, LSD magnetic measurements and EWs of helium lines. We used an extensive NLTE TLUSTY grid along with the SYNSPEC code to model the observed spectra and find a new value of luminosity. In this poster we present the derived physical parameters of the star and the results of Magnetic Doppler Imaging analysis of the Stokes I and V profiles. Wide wings of helium lines can be described only under the assumption of the presence of a large, very helium-rich spot.

preprint2013arXivOpen access
I. YakuninG. WadeD. BohlenderO. KochukhovV. TsymbalMiMeS Collaborators
astro-ph.SR
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I. YakuninG. WadeD. BohlenderO. KochukhovV. TsymbalMiMeS Collaborators

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