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arxiv: 1811.10113 · v1 · pith:JEPK32UEnew · submitted 2018-11-25 · 🌌 astro-ph.SR

Extreme resonance line profile variations in the ultraviolet spectra of NGC 1624-2: probing the giant magnetosphere of the most strongly magnetized known O-type star

A. David-Uraz (1) , C. Erba (1) , V. Petit (1) , A. W. Fullerton (2) , F. Martins (3) , N. R. Walborn (2) , R. MacInnis (1) , R. H. Barb\'a (4)
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D. H. Cohen (5) J. Ma\'iz Apell\'aniz (6) Y. Naz\'e (7) S. P. Owocki (1) J. O. Sundqvist (8) A. ud-Doula (9) G. A. Wade (10) ((1) Department of Physics Astronomy University of Delaware Newark DE 19716 USA (2) Space Telescope Science Institute 3700 San Martin Drive Baltimore MD 21218 (3) LUPM-UMR 5299 CNRS & Universit\'e Montpellier Place Eugene Bataillon 34095 Montpellier Cedex 05 France (4) Departamento de F\'isica y Astronom\'ia Universidad de La Serena Av. Cisternas 1200 Norte La Serena Chile (5) Department of Physics Swarthmore College Swarthmore PA 19081 (6) Centro de Astrobiolog\'ia CSIC-INTA. Campus ESAC. Camino bajo del castillo s/n. E-28 692 Villanueva de la Ca\~nada. Spain (7) Universit\'e de Li\`ege Quartier Agora (B5c Institut d'Astrophysique et de G\'eophysique) All\'ee du 6 Ao\^ut 19c B-4000 Sart Tilman Li\`ege Belgium (8) Instituut voor Sterrenkunde KU Leuven Celestijnenlaan 200D B-3001 Leuven (9) Penn State Scranton 120 Ridge View Drive Dunmore PA 18512 (10) Department of Physics Space Science Royal Military College of Canada PO Box 17000 Stn Forces Kingston Ontario K7K 7B4 Canada)
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classification 🌌 astro-ph.SR
keywords magneticmagnetospherestarstarsstateextremeknowno-type
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In this paper, we present high-resolution HST/COS observations of the extreme magnetic O star NGC 1624-2. These represent the first ultraviolet spectra of this archetypal object. We examine the variability of its wind-sensitive resonance lines, comparing it to that of other known magnetic O stars. In particular, the observed variations in the profiles of the CIV and SiIV doublets between low state and high state are the largest observed in any magnetic O-type star, consistent with the expected properties of NGC 1624-2's magnetosphere. We also observe a redshifted absorption component in the low state, a feature not seen in most stars. We present preliminary modelling efforts based on the Analytic Dynamical Magnetosphere (ADM) formalism, demonstrating the necessity of using non-spherically symmetric models to determine wind/magnetospheric properties of magnetic O stars.

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