Evidence for Mg and /Fe, Si/ phase separation in interstellar dust

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Interstellar Matter, Iron Compounds, Magnesium, Phase Separation (Materials), Silicon Compounds, Abundance, Cosmic Dust, Infrared Spectra

Scientific paper

Analysis of the depletions of Mg, Si, and Fe in diffuse clouds shows
that distinct Mg-rich and (Fe, Si)-rich dust components exist in diffuse
clouds. It is unlikely that more than 65% of interstellar Mg is ever
contained in silicates. Depletion in diffuse clouds may occur by
selective accretion on (Fe, Si)-oxide cores.

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