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Interstellar solid CO - Polar and nonpolar interstellar ices
Tielens, A. G. G. M.; Tokunaga, A. T.; Geballe, T. R.; Baas, F.
AA(NASA, Ames Research Center, Moffett Field, CA), AB(Hawaii, University, Honolulu), AC(Joint Astronomy Centre, Hilo, HI), AD(Joint Astronomy Centre, Hilo, HI)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 181-199. (ApJ Homepage)
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NASA/STI Keywords:
Carbon Monoxide, Dark Matter, Interstellar Matter, Molecular Clouds, Ice, Infrared Spectra, Pre-Main Sequence Stars
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Observations of the solid-CO lines corresponding to particular protostars are compared with respect to peak position and width and contrasted with the solid CO bands derived experimentally for astrophysical mixtures. Most lines of sight reveal narrow and broad observational solid-CO components; the narrow band appears when nonpolar molecules are dominant. When the concentration of CO is greater than 0.3 the 'surface modes' of the protostars are responsible for the position and shape of the CO fundamental. Some variations of the parameters are related to the composition and/or morphology of the grains particularly at the interstellar 2140/cm line. Grain mantles are theorized to be composed of both a polar and a nonpolar mixtures which reflect the chemical variations associated with accretion.

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