Dust grain processing in the Orion nebula

Details Dust grain processing in the Orion nebula Dust grain processing in the Orion nebula

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..594s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 15, 1992, p. 594-602.

Astronomy and Astrophysics

Astronomy

6

Cosmic Dust, Grain Size, Interstellar Extinction, Molecular Clouds, Orion Nebula, Star Formation, Amorphous Materials, Astronomical Models, Carbon, Particle Size Distribution, Silicates

Scientific paper

A grain model is presented in which the nebular dust has a silicate and carbon composition and a bimodal size spectrum characterized by a division into large and small particles. Small grains (less than or equal to 0.01 micron) consist of silicate and amorphous carbon particles graphitized by OB stellar radiation, and large grains consist of porous aggregates of silicate subgrains. Large carbon grains are subjected to chemical attack by gas-phase H and O atoms which explains their absence in the size spectrum. The average nebula extinction curve observed for theta1 and theta2 Ori stars from infrared to far-ultraviolet wavebands can be explained using the grain model. Model extinction curves are found to agree well with the data provided that the small-grain population is swept up into large silicates, the swept-up carbon particles are subjected to chemical erosion, and large silicate grains survive grain erosion mechamisms. It is concluded that the evolution of the silicate dust in the Orion nebula is opposite to what is expected from grain processing by supernova shocks.

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