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.
16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
- Pub Date:
- December 2011
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Instrumentation and Methods for Astrophysics
- 8 pages, 3 figures, submitted to the proceedings of the 16th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun (2010 August 29 - September 2, Seattle, USA)