On the formation of meteoritic chondrules by aerodynamic drag heating in the solar nebula

Details On the formation of meteoritic chondrules by aerodynamic drag heating in the solar nebula On the formation of meteoritic chondrules by aerodynamic drag heating in the solar nebula

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..70...11w&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 70, no. 1, Sept. 1984, p. 11-26.

Astronomy and Astrophysics

Astronomy

71

Aerodynamic Drag, Aerodynamic Heating, Chondrule, Meteoritic Composition, Solar Corona, Stellar Evolution, Astronomical Models, Cosmic Dust, Cosmic Gases, Interstellar Matter, Meteorites, Formation, Chondrules, Aerodynamics, Drag, Heating, Solar Nebula, Grains, Velocity, Distance, Energy, Thermal Effects, Optical Properties, Opacity, Temperature, Aggregates, Melting, Physical Properties, Samples, Meteorite, Hypotheses

Scientific paper

During the formation of the solar nebula, interstellar grains were falling into the nebula with velocities of the order of 10 km/s at the radial distance where the meteorites were to form. This kinetic energy is 20 times the amount of thermal energy needed to melt the grains. The grains were decelerated by aerodynamic drag in the nebula. Where grain-rich parcels of interstellar material fell into the nebula, heat generated by drag could not be radiated away because of the opacity imparted to the system by the grains, and high temperatures were reached. In this situation presolar aggregations of grains would melt to form chondrules. Many of the properties of chondrules (and also Ca/Al-rich inclusions) are consistent with their formation by this means. The infall-heating concept provides a new framework in which the formation and significance of chondritic meteorites can be understood.

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