Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181p..51h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Nov. 1977, p. 51P-55P.
Astronomy and Astrophysics
Astronomy
14
Hydroxyl Emission, Infrared Astronomy, Interstellar Masers, Molecular Spectra, Polysaccharides, Absorption Spectra, Astronomical Models, Clouds, Cosmic Dust, Optical Thickness
Scientific paper
The spectrum of the infrared/OH maser source OH 26.5+0.6 over the wavelength range from 2 to 40 microns is discussed. Arguments, laboratory data, and theoretical results are summarized which favor the proposal that the IR spectra of many galactic IR sources can be readily explained if polysaccharides form the main component of interstellar dust. A model is described wherein an IR-emitting source is assumed to be a hot polysaccharide dust cloud at a temperature which is optically thin at IR wavelengths and radiation from the source is assumed to traverse a cooler dust cloud composed of the same particulate material. The flux received by an observer is analyzed, and the spectral data for OH 26.5+0.6 are fitted to a hot-cloud temperature of 430 K and a value of 2.6 for some unidentified parameter. It is noted that the maximum IR optical depth through the emitting cloud should not exceed about 1 magnitude.
Hoyle Fiona
Wickramasinghe Chandra N.
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