Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..45..467l&link_type=abstract
Astrophysics and Space Science, vol. 45, Dec. 1976, p. 467-476.
Astronomy and Astrophysics
Astronomy
1
Granular Materials, Infrared Spectra, Interstellar Matter, Nebulae, Astronomical Models, Hydrogen Clouds, Infrared Astronomy, X Ray Sources
Scientific paper
Infrared observations of the Orion nebula have been interpreted by Rowan-Robinson (1975) to imply the existence of 'giant' grains, radius about 0.01 cm, throughout a volume about a parsec in diameter. Although Rowan-Robinson's model of the nebula has been criticized and the presence of such grains in Orion is disputed, the proposition that they exist is accepted pro tem, and situations are examined in which giant grains could arise. It is found that, while a giant-grain component of the interstellar grain density may exist, it is difficult to understand how giant grains arise to the extent apparently required by the Orion nebula model.
Leitch-Devlin M. A.
Millar Thomas J.
Williams David. A.
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