SIMBAD references

1996A&A...309..258G - Astronomy and Astrophysics, volume 309, 258-266 (1996/5-1)

What are the true astronomical silicates?


Abstract (from CDS):

We redefine the term "astronomical silicate" by interpreting the 9.7µm and 18µm interstellar features not in terms of absorption by a pure silicate but rather in terms of silicate core-organic refractory mantle particles. The silicate core optical properties used are those of a glassy (amorphous) olivine produced in the laboratory. The optical constants of the organic refractory mantle material are derived from a combination of astronomical and laboratory spectra of residues of ultraviolet photoprocessed ices, which we define as ``astronomical organic refractory". The silicate core-organic refractory mantle elongated dust model provides an excellent match to the observation of the Becklin-Neugebauer object polarization features in shape, width, and in relative strength. An additional ice mantle is included on a fraction of the dust in the line of sight to the BN object which is consistent with the 3.1 µm absorption strength. This further improves the match to observations.

Abstract Copyright:

Journal keyword(s): ISM: dust - Orion: BN object - infrared - ISM: lines and bands - methods: laboratory

Simbad objects: 6

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