An Analysis of Oxygen-Rich Dust Spectra from the Short Wavelength Spectrometer on the \em{Infrared Space Observatory}

Details An Analysis of Oxygen-Rich Dust Spectra from the Short Wavelength Spectrometer on the \em{Infrared Space Observatory} An Analysis of Oxygen-Rich Dust Spectra from the Short Wavelength Spectrometer on the \em{Infrared Space Observatory}

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.9204s&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #92.04; Bulletin of the American Astronomical Society, Vol. 33, p.1440

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Scientific paper

We present initial results of an on-going analysis of the spectra from 160 oxygen-rich dust shells observed by the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory. The strength of the dust emission feature at 13 μ m correlates with the strength of another dust feature centered ~19.5 μ m. These features occasionally appear superimposed on the broader emission features from amorphous silicates at 10 and 18 μ m, but they appear more often in spectra showing lower-contrast dust emission from amorphous alumina or in some cases from spectra showing little or no other dust emission. Comparison of the spectra with laboratory data of crystalline alumina (α --Al2O3), which show emission features at 13 and 21 μ m, would strengthen the case for crystalline alumina as the carrier of the 13 μ m feature if the shift from 21 to 19.5 μ m could be explained. We also investigate several additional spectral features. These include the possible emission feature at 7 μ m, possible narrow dust features at 12 and 18 μ m which may be related to the 13 μ m feature, the CO2 emission bands (at 13.9, 14.9, and 16.2 μ m), and the atmospheric absorption bands from CO, SiO, and other molecules in the 2--10 μ m spectal region.

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