Interplanetary material as a guide to the composition of interstellar grains

Details Interplanetary material as a guide to the composition of interstellar grains Interplanetary material as a guide to the composition of interstellar grains

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224..473j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Jan. 15, 1987, p. 473-479.

Astronomy and Astrophysics

Astronomy

9

Astronomical Models, Chemical Composition, Interplanetary Dust, Interstellar Matter, Meteoritic Composition, Galactic Evolution, Iron Compounds, Magnesium Compounds, Mineralogy, Silicates, Solar System, Interplanetary Dust, Grains, Composition, Models, Silicates, Magnesium, Iron, Depletion, Particles, Chondritic Material, Uocs, Meteorites, Olivine, Enrichment, Sulphides, Aggregates, Polarization, Structure, Magnetic Properties, Mineralogy, Diagrams

Scientific paper

A compositional model for interstellar magnesium-iron silicate and iron-containing grains is derived under the constraint of elemental depletions, and using the composition of primitive solar system material as a paradigm of the interstellar particles. The solar system material invoked includes both chondritic porous aggregate interplanetary dust particles and unequilibrated ordinary chondritic meteorites. It is shown that the interstellar silicate grains are olivine rich (olivine-to-pyroxene grain mass ratio of greater than 0.8) and are iron rich (magnesium-to-iron atomic ratio of greater than 0.65). Iron not incorporated into silicates is assumed to be depleted into the iron sulphide pyrrhotite which makes up less than 6 percent of the refractory grain mass. The inclusion of grains of this magnetic sulphide into aggregate interstellar grains can explain the alignment of the grains responsible for the polarization in the visual.

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