The many faces of Betelgeuse

Details The many faces of Betelgeuse The many faces of Betelgeuse

2010-12-02

arxiv.org/abs/1012.0377v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 3 figures, submitted to the proceedings of the 16th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun (20

Scientific paper

The dynamics of the surface and inner atmosphere of the red supergiant star Betelgeuse are the subject of numerous high angular resolution and spectroscopic studies. Here, we present three-telescope interferometric data obtained at 11.15 microns wavelength with the Berkeley Infrared Spatial Interferometer (ISI), that probe the stellar surface continuum. We find striking variability in the size, effective temperature, and degree of asymmetry of the star over the years 2006-2009. These results may indicate an evolving shell of optically thick material close to the stellar photosphere.

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