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The Theory of Cosmic Grains : Astrophysics and Space Science Library (Hardcover) - N.C. Wickramasinghe

The Theory of Cosmic Grains

Astrophysics and Space Science Library (Hardcover)

Hardcover Published: 31st October 1991
ISBN: 9780792311898
Number Of Pages: 307

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Light scattering and absorption by small homogeneous particles can be worked-out exactly for spheres and infinite cylinders. Homogeneous particles of irregular shapes, when averaged with respect to rotation, have effects that can in general be well-approximated by reference to results for these two idealised cases. Likewise, small inhomogeneous particles have effects similar to homogeneous particles of the same average refractive index. Thus most problems can be solved to a satisfactory approximation by reference to the exact solutions for spheres and cylinders, which are fully stated here in the early part of the book. The sum of scattering and absorption, the extinction, is too large to be explained by inorganic materials, provided element abundances in the interstellar medium are not appreciably greater than solar, H 0 and NH3 being essentially excluded in the 2 general medium, otherwise very strong absorptions near 3p,m would be observed which they are not. A well-marked extinction maximum in the ultraviolet near 2200A has also not been explained satisfactorily by inorganic materials. Accurately formed graphite spheres with radii close to O.02p,m could conceivably provide an explanation of this ultraviolet feature but no convincing laboratory preparation of such spheres has ever been achieved.

Electromagnetic Properties of Small Particles
Interstellar Extinction and Polarisation
Reflection Nebulae and the Diffuse Galactic Light
Interactions between Dust, Gas and Radiation
Inorganic Theories of Grain Formation
The Organic Grain Model
Models of the Extinction and Polarisation of Starlight
Spectroscopic Identifications
Dust in External Galaxies
Table of Contents provided by Publisher. All Rights Reserved.

ISBN: 9780792311898
ISBN-10: 0792311892
Series: Astrophysics and Space Science Library (Hardcover)
Audience: General
Format: Hardcover
Language: English
Number Of Pages: 307
Published: 31st October 1991
Publisher: Springer
Country of Publication: NL
Dimensions (cm): 23.39 x 15.6  x 1.91
Weight (kg): 0.63

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