Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.1802s&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #18.02; Bulletin of the American Astronomical Society, Vol. 25, p.1320
Other
Scientific paper
We have observed the extreme carbon star IRC+10216 with a long-slit mid-infrared spectrometer. Maximum entropy reconstructions of the images, taken with the slit oriented north/south and east/west, reveal three major components. A bright, symmetric central core with a full width at half maximum of two thirds of an arcsecond dominates the total emission from the source. Its spatial and spectral properties are consistent with a full or partial shell of optically thick amorphous carbon dust. An elongated dust shell (4'' N/S times 3'' E/W) surrounds the central core and shows strong SiC emission. We have also detected unusually blue radiation from 0.!=gthinspace''5 south and 1.!=gthinspace''0-1.!=gthinspace''5 north of the central core, inside the outer shell. Scattering alone cannot produce this emission because the central star does not radiate strongly enough at 8 microns. Amorphous carbon dust 0.!=gthinspace''5-1.!=gthinspace''0 from the central star would not be hot enough to fully fit the observed spectra, although a combination of thermal emission and scattering might. Other possibilities include flourescent processes or emission in shock fronts in the polar outflows.
Egan Michael P.
Shipman Russell F.
Sloan Greg C.
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