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Phase-resolved ultraviolet spectroscopy of the magnetic Of?p star HD 191612

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arxiv 1302.4708 v1 pith:RQHS7IDR submitted 2013-02-19 astro-ph.SR

W. L. F. Marcolino , J. -C. Bouret , J. O. Sundqvist , N. R. Walborn , A. W. Fullerton , I. D. Howarth , G. A. Wade , A. ud-Doula This is my paper · ORCID
classification astro-ph.SR
keywords magneticstarwindatmospherelinemodelsobservedphase-resolved
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We present for the first time phase-resolved UV spectroscopy of an Of?p star, namely, HD 191612. The observations were acquired with the Space Telescope Imaging Spectrograph (STIS) on-board the Hubble Space Telescope (HST). We report the variability observed in the main photospheric and wind features and compare the results with previous findings for the Of?p star HD 108. We show that UV line strengths, H(alpha), and longitudinal magnetic field, vary coherently according to the rotational period (P = 537.6d), providing additional support for the magnetic oblique rotator scenario. The stellar and wind parameters of HD 191612 are obtained based on NLTE expanding atmosphere models. The peculiar wind line profile variations revealed by the new STIS data - not reproduced by 1D atmosphere models - are addressed through non-spherical MHD simulations coupled with radiative transfer. The basic aspects of the UV variability observed are explained and the structure of the dynamical magnetosphere of HD 191612 is discussed.

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    astro-ph.SR 2026-05 unverdicted novelty 5.0 of 10

    GMRT sub-GHz survey of 44 magnetic hot stars detects emission in 11 cases and finds scaling of radio luminosity with magnetic field and rotation period consistent with higher-frequency work.

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