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| Paper: |
The Many Faces of Betelgeuse |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1025 |
| Authors: |
Ravi, V.; Wishnow, E.; Lockwood, S.; Townes, C. |
| Abstract: |
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 μm 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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