NGC 1624-2: A slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field Auteur(s): Wade G. a., Apellańiz J. maíz, Martins F., Petit V., Grunhut J., Walborn N. r., Barbá R. h., Gagné M., García-melendo E., Jose J., Moffat A. f. j., Nazé Y., Neiner C., Pellerin A., Ordaz M. penade ?s, Shultz M., Simón-díaz S., Sota A., Collaboration The mimes (Document sans référence bibliographique) 2012-06-13Texte intégral en Openaccess : Ref Arxiv: 1206.2834 Ref. & Cit.: NASA ADS Résumé: This paper presents a first observational investigation of the faint Of?cp star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission and magnetospheric properties. Modeling the spectrum and spectral energy distribution, we conclude that NGC 1624-2 is a main sequence star of mass M {\simeq} 30 M{\odot}, and infer an effective temperature of 35 {\pm} 2 kK and log g = 4.0 {\pm} 0.2. Based on an extensive time series of optical spectral observations we report significant variability of a large number of spectral lines, and infer a unique period of 157.99 {\pm} 0.94 d which we interpret as the rotational period of the star. We report the detection of a very strong - 5.35 {\pm} 0.5 kG - longitudinal magnetic field Commentaires: 17 pages, MNRAS accepted and in press |