MOST Observations of σ Ori E: Challenging the Centrifugal Breakout Narrative

Type Journal Article
Names R. H. D. Townsend, Th. Rivinius, J. F. Rowe, A. F. J. Moffat, J. M. Matthews, D. Bohlender, C. Neiner, J. H. Telting, D. B. Guenther, T. Kallinger, R. Kuschnig, S. M. Rucinski, D. Sasselov, W. W. Weiss
Publication The Astrophysical Journal
Volume 769
Pages 33
Journal Abbreviation The Astrophysical Journal
Date May 1, 2013
DOI 10.1088/0004-637X/769/1/33;
ISSN 0004-637X
Short Title MOST Observations of σ Ori E
URL http://adsabs.org/2013ApJ.769.33T
Library Catalog labs.adsabs.harvard.edu
Abstract We present results from three weeks' photometric monitoring of the magnetic helium-strong star σ Ori E using the Microvariability and Oscillations of Stars microsatellite. The star's light curve is dominated by twice-per-rotation eclipse-like dimmings arising when magnetospheric clouds transit across and occult the stellar disk. However, no evidence is found for any abrupt centrifugal breakout of plasma from the magnetosphere, either in the residual flux or in the depths of the light minima. Motivated by this finding we compare the observationally inferred magnetospheric mass against that predicted by a breakout analysis. The large discrepancy between the values leads us to argue that centrifugal breakout does not play a significant role in establishing the magnetospheric mass budget of σ Ori E.
Tags circumstellar matter, stars: chemically peculiar, stars: early-type, stars: individual: HD 37479, stars: magnetic field, stars: rotation
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