Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4716r&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #47.16; Bulletin of the American Astronomical Society, Vol. 29, p.1287
Astronomy and Astrophysics
Astronomy
Scientific paper
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 ~ 5arcsec from the star. The inner 1arcsec 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.
Hayward Thomas L.
Houck James R.
Rinehart Stephen Andrew
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