Modeling the Magnetosphere of the B2Vp star sigma Ori E - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: This paper presents results obtained from Stokes I and V spectra of the B2Vpstar sigma Ori E, observed by both the Narval and ESPaDOnS spectropolarimeters.Using Least- Squares Deconvolution, we investigate the longitudinal magneticfield at the current epoch, including period analysis exploiting current andhistorical data. sigma Ori E is the prototypical helium-strong star that hasbeen shown to harbor a strong magnetic field, as well as a magnetosphere,consisting of two clouds of plasma forced by magnetic and centrifugal forces toco-rotate with the star on its 1.19 day period. The Rigidly RotatingMagnetosphere RRM model of Townsend and Owocki 2005 approximately reproducesthe observed variations in longitudinal field strength, photometric brightness,Halpha emission, and various other observables. There are, however, smalldiscrepancies between the observations and model in the photometric lightcurve, which we propose arise from inhomogeneous chemical abundances on thestar-s surface. Using Magnetic Doppler Imaging MDI, future work will attemptto identify the contributions to the photometric variation due to abundancespots and due to circumstellar material.



Author: M.E. Oksala, G.A. Wade, R.H.D Townsend, O. Kochukhov, S. Owocki

Source: https://arxiv.org/







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