Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18111406s&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #114.06D; Bulletin of the American Astronomical Society, Vol. 24, p.1302
Astronomy and Astrophysics
Astronomy
Scientific paper
Using a long-slit 10 microns spectrometer and new data analysis techniques, I have resolved and studied the circumstellar emission from two evolved stars, alpha Orionis and HD 44179. Maximum entropy reconstruction of alpha Ori reveals that emission from the object arises from two sources, an unresolved photosphere and an extended region of silicate dust emission. Reconstructions of HD 44179 resolve it into a cool central continuum source embedded within an extended region emitting the unidentified infrared (UIR) emission features at 7.7, 8.6, 11.3, and 12.7 microns. As the distance from the central source increases, the strength of the 7.7 microns feature decreases with respect to the 8.6 and 11.3 microns features, and there is an enhancement in the strength of the 11.3 microns emission roughly 1.5 arcsec from the central source. These results indicate that the UIR carriers are forming roughly 0.5 arcsec from the central source and evolving as they move outward.
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