Spatially resolved spectra of silicate dust around alpha Orionis

G.C. Sloan (Wyoming), G.L. Grasdalen (G-star Ent.), P.D. LeVan (Phillips Lab./GPOB)

1993a, ApJ, 404, 328

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We have observed alpha Orionis with a 10 µm long-slit spectrometer. By applying maximum entropy reconstruction techniques, we have spatially resolved the silicate emission from the circumstellar shell. The emission derived from our silicate spectrum compares favorably with published emissivity profiles describing circumstellar silicates. The lack of silicate emission in the direction of the central star suggests that the circumstellar dust may not be distributed in a spherical shell.

This paper represents chapter 4 of Sloan's dissertation, and was the first in a series of papers presenting results of maximum entropy reconstructions of long-slit mid-infrared spectra. Preliminary results of the reconstructions were originally presented at the Atlanta meeting of the AAS in January, 1992 (Sloan, Grasdalen, and LeVan 1991, BAAS, 23, 1386).

Dissertation, Chapter 3 - Grasdalen et al. 1992, “Spatial structure in the 10 micron spectrum of HD 44179 (The Red Rectangle)”

Dissertation, Chapter 5 - Sloan et al. 1993b, “Spatially resolved spectra of the unidentified infrared features around HD 44179 (The Red Rectangle)”

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Last modified 27 May, 2008. © Gregory C. Sloan and others.