Astrophysics and Space Science

, Volume 34, Issue 1, pp 33–38 | Cite as

Diffuse interstellar band formation in dense clouds

  • Theodore P. SnowJr.
  • Judith G. Cohen


Measurements of the strengths of the diffuse interstellar bands at 4430, 5780 and 5797 Å show that the bands tend to be week with respect to extinction in dense interstellar clouds. Data on 10 stars in the ϱ Ophiuchi cloud complex show further that the diffuse band-producing efficiency of the grains decreases systematically with increasing grain size. It is concluded that the diffuse bands are not formed in the mantles which accrete on the grains in interstellar clouds, but that they could be produced in the cores of grains or in some molecular species.


Grain Size Molecular Species Band Formation Dense Cloud Interstellar Cloud 
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Copyright information

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • Theodore P. SnowJr.
    • 1
  • Judith G. Cohen
    • 2
  1. 1.Princeton University ObservatoryPrincetonU.S.A.
  2. 2.Kitt Peak National ObservatoryTucsonU.S.A.

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