Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..654v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 15, 1987, p. 654-665.
Astronomy and Astrophysics
Astronomy
36
Cosmic Dust, Hydroxyl Emission, Infrared Absorption, Infrared Stars, Interstellar Extinction, Stellar Envelopes, Infrared Astronomy Satellite, Stellar Color, Stellar Temperature
Scientific paper
The IRAS Low Resolution Spectra of 467 sources with the 10 micron dust feature are analyzed. The strengths of the dust feature are determined by the ratio of the flux at 9.7 micron to the fitted continuum level. Color temperatures are derived from the fluxes of the four IRAS photometric bands after correcting for the effect of the 10 micron feature on the fluxes of the 12 micron band. A definite correlation between the strength of the feature and the color temperature of the continuum is found, implying that the 10 micron dust feature is largely circumstellar in origin. A reexamination of the strength of the silicate feature for seven of the OH/IR star used by Gehrs and colleagues in 1985 has failed to reproduce the optical depth-distance relationship found by these authors. It is concluded that interstellar extinction does not play a major role in the formation of the 10 micron absorption feature.
Kwok Sun
Volk Kevin
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