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Title:
The Rigidly Rotating Magnetosphere of σ Orionis E
Authors:
Townsend, R. H. D.; Owocki, S. P.; Groote, D.
Affiliation:
AA(Bartol Research Institute, University of Delaware, 217 Sharp Lab, Newark, DE 19716; , .), AB(Bartol Research Institute, University of Delaware, 217 Sharp Lab, Newark, DE 19716; , .), AC(Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany; .)
Publication:
The Astrophysical Journal, Volume 630, Issue 1, pp. L81-L84. (ApJL Homepage)
Publication Date:
09/2005
Origin:
UCP
ApJ Keywords:
Stars: Circumstellar Matter, Stars: Chemically Peculiar, Stars: Early-Type, stars: individual (HD 37479), Stars: Magnetic Fields, Stars: Rotation
DOI:
10.1086/462413
Bibliographic Code:
2005ApJ...630L..81T

Abstract

We characterize the observed variability of the magnetic helium-strong star σ Ori E in terms of a recently developed rigidly rotating magnetosphere model. This model predicts the accumulation of circumstellar plasma in two corotating clouds, situated in magnetohydrostatic equilibrium at the intersections between the magnetic and rotational equators. We find that the model can reproduce well the periodic modulations observed in the star's light curve, Hα emission-line profile, and longitudinal field strength, confirming that it furnishes an essentially correct, quantitative description of the star's magnetically controlled circumstellar environment.
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