Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..611f&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, Oct. 15, 1979, p. 611-620.
Astronomy and Astrophysics
Astronomy
74
Astronomical Spectroscopy, Infrared Astronomy, Infrared Spectra, Oxygen, Stellar Spectra, Supergiant Stars, Abundance, Carbonaceous Chondrites, Cosmic Dust, Late Stars, Silicates, Stellar Envelopes
Scientific paper
Airborne observations of the 16-39-micron spectra of 10 oxygen-rich stars with excess emission in the infrared have been obtained. The stars show excess emission attributed to circumstellar dust grains in the 16-39-micron region in the form of a broad hump peaking near 18 microns and falling smoothly to longer wavelengths. The emission is similar in character to the emission from the Trapezium region of the Orion Nebula, indicating the grain materials are quite similar in these objects. The existence of a feature in the 20-micron region is consistent with the O-Si-O bending resonance expected for silicate material. The lack of any sharp structure in the spectra indicates the silicate is in an amorphous, disordered form. A simple model of small grains of carbonaceous chondrite silicate material in a diffuse circumstellar envelope is shown to give a good qualitative fit to the observed 8-39-micron circumstellar spectra. Comparison of the observed spectra with the model spectra indicates the grain emissivity falls as the inverse square of wavelength from 20 to 40 microns.
Forrest William John
Houck James R.
McCarthy Joseph F.
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