Modeling the magnetosphere of the B2Vp star σ Ori E

Type Conference Paper
Names Mary E. Oksala, Gregg A. Wade, Rich H. D. Townsend, Oleg Kochukhov, Stan P. Owocki
Conference Name IAU Symposium
Volume 272
Pages 124-129
Date July 1, 2011
Library Catalog NASA ADS
Abstract This paper presents results obtained from Stokes I and V spectra of the B2Vp star sigma Ori E, observed by both the Narval and ESPaDOnS spectropolarimeters. Using Least-Squares Deconvolution, we investigate the longitudinal magnetic field at the current epoch, including period analysis exploiting current and historical data. σ Ori E is the prototypical helium-strong star that has been shown to harbor a strong magnetic field, as well as a magnetosphere, consisting of two clouds of plasma forced by magnetic and centrifugal forces to co-rotate with the star on its 1.19 day period. The Rigidly Rotating Magnetosphere (RRM) model of Townsend & Owocki (2005) approximately reproduces the observed variations in longitudinal field strength, photometric brightness, Hα emission, and various other observables. There are, however, small discrepancies between the observations and model in the photometric light curve, which we propose arise from inhomogeneous chemical abundances on the star's surface. Using Magnetic Doppler Imaging (MDI), future work will attempt to identify the contributions to the photometric variation due to abundance spots and due to circumstellar material.
Tags Stars: Circumstellar Matter, Techniques: Polarimetric, stars: early-type, stars: individual (HD 37479), stars: magnetic fields, stars: rotation
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