The Composition of Interstellar Dust
The majority of interstellar grain models are based on a dust population composed of carbon and silicate grains. Abundance studies using high-resolution absorption line spectra, however, suggest that other grain types, perhaps oxides or metal grains, are prevalent in interstellar clouds. The data further suggest that not enough carbon is depleted from the gas-phase interstellar medium to account for the carbon-based grains often used to explain the measured optical and UV dust opacity. Silicon atoms are likely to be more populous in grain mantles than in silicate grain cores.
KeywordsSilicon Atom Hubble Space Telescope Interstellar Cloud Interstellar Dust Diffuse Cloud
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- Cardelli, J.A., Meyer, D.M., Jura, M. Savage, B.D.(1996) The Abundance of Interstellar Carbon, ApJ, in press.Google Scholar