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Diffuse interstellar band formation in dense clouds

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Abstract

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.

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Authors and Affiliations

  1. Princeton University Observatory, Princeton, N.J., U.S.A.

    Theodore P. Snow Jr.

  2. Kitt Peak National Observatory, Tucson, Ariz., U.S.A.

    Judith G. Cohen

Authors
  1. Theodore P. Snow Jr.
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  2. Judith G. Cohen
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Additional information

Visiting Astronomer, Kitt Peak National Observatory, which is operated by the Associated Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.

Part of this study was carried out by the author at the University of Washington.

Operated by the Associated Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.

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Snow, T.P., Cohen, J.G. Diffuse interstellar band formation in dense clouds. Astrophys Space Sci 34, 33–38 (1975). https://doi.org/10.1007/BF00646745

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  • DOI: https://doi.org/10.1007/BF00646745

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