The Theory of Cosmic Grains

  • F. Hoyle
  • N. C. Wickramasinghe

Part of the Astrophysics and Space Science Library book series (ASSL, volume 168)

Table of contents

  1. Front Matter
    Pages i-ix
  2. F. Hoyle, N. C. Wickramasinghe
    Pages 1-14
  3. F. Hoyle, N. C. Wickramasinghe
    Pages 15-46
  4. F. Hoyle, N. C. Wickramasinghe
    Pages 47-71
  5. F. Hoyle, N. C. Wickramasinghe
    Pages 72-93
  6. F. Hoyle, N. C. Wickramasinghe
    Pages 94-127
  7. F. Hoyle, N. C. Wickramasinghe
    Pages 128-151
  8. F. Hoyle, N. C. Wickramasinghe
    Pages 152-177
  9. F. Hoyle, N. C. Wickramasinghe
    Pages 178-215
  10. F. Hoyle, N. C. Wickramasinghe
    Pages 216-275
  11. F. Hoyle, N. C. Wickramasinghe
    Pages 276-292
  12. Back Matter
    Pages 293-307

About this book

Introduction

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.

Keywords

Galaxy galaxies stellar

Authors and affiliations

  • F. Hoyle
    • 1
  • N. C. Wickramasinghe
    • 2
  1. 1.BournemouthUK
  2. 2.School of MathematicsUniversity of WalesCardiffUK

Bibliographic information

  • DOI https://doi.org/10.1007/978-94-011-3402-6
  • Copyright Information Kluwer Academic Publishers 1991
  • Publisher Name Springer, Dordrecht
  • eBook Packages Springer Book Archive
  • Print ISBN 978-94-010-5505-5
  • Online ISBN 978-94-011-3402-6
  • Series Print ISSN 0067-0057
  • About this book
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