Observations of two non-standard grain components.

Details Observations of two non-standard grain components. Observations of two non-standard grain components.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996nascp3339..113s&link_type=abstract

Scientific conference: From stardust to planetesimals, p. 113 - 116

Astronomy and Astrophysics

Astronomy

Interstellar Grains: Composition, Interstellar Grains: Infrared Spectra, Interstellar Grains: Models

Scientific paper

The authors discuss evidence for two non-standard grain components: small conglomerates and astronomical iron. For high UV radiation regimes, such as H II regions, conglomerate grains best explain the reduction of 25 μm emission relative to 12 μm. Astronomical iron was proposed to account for the strength of the 60 μm emission. Analysis of IRAS data shows the presence of a strong 60 μm emitter in the λ Orionis H II region and a component within the Rosette Nebula emitting primarily at 25 μm. Both of these observations can be accommodated by the presence of iron grains within the H II regions.

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