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Session 47 - Circumstellar Disks & Shells.
Display session, Thursday, January 08
Exhibit Hall,
We have imaged the M2Iab supergiant star \alpha Ori at 11.7 \micron \ and 17.9 \micron \ using an array camera with sub-arcsecond angular resolution. Our images reveal the circumstellar dust shell extending out to \sim 5\arcsec from the star. The inner 1\arcsec of the shell has been previously detected by interferometric techniques. By fitting two multi-parameter models to the data, we find values for the dust shell inner radius, the temperature at this radius, the percentage flux produced by the circumstellar material at each of our wavelengths, and the radial dependence of the dust mass density. We present profiles of the mean surface brightness as a function of radius and the power detected from within annular rings as a function of radius.
