What are the true astronomical silicates?

Details What are the true astronomical silicates? What are the true astronomical silicates?

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..258g&link_type=abstract

Astronomy and Astrophysics, v.309, p.258-266

Astronomy and Astrophysics

Astrophysics

59

Ism: Dust, Orion: Bn Object, Infrared, Ism: Lines And Bands, Methods: Laboratory

Scientific paper

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.

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