Sub-Arcsecond 10\ microns Imaging of Circumstellar Dust Around Cool Stars

Details Sub-Arcsecond 10\ microns Imaging of Circumstellar Dust Around Cool Stars Sub-Arcsecond 10\ microns Imaging of Circumstellar Dust Around Cool Stars

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8303d&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #83.03; Bulletin of the American Astronomical Society, Vol. 26, p.1455

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used a scanned imaging technique with a simple linear infrared array to directly image the 10 microns emission from cool stars. At 3-m telescopes, the spatial resolution of our instrument is set by the diffraction limit of the telescope: FWHM ~ 0.7". Deconvolution can achieve a spatial resolution of ~ 0.35". Images at these spatial scales permit mapping of the relatively cool dust grains surrounding supergiant stars, which emit strongly at 10\ microns. We find that the 10\ microns emission from IRC +10420 and alpha Sco is resolved at such scales. We use these measurements to set interesting observational constraints on dust grains originating in circumstellar outflows. We present plausible models for the circumstellar dust and compare our results with models of grains in the interstellar medium.

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