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The extinction of starlight at wavelengths near 2200 Å

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Abstract

A recent suggestion that the extinction of starlight at wavelengths near 2200 Å may be due to small grains of magnesium oxide, rather than due to graphite, does not seem plausible. The potential ability of graphite to produce ultraviolet extinction is shown to be an order of magnitude greater than the extinction which MgO grains could produce under the most favourable assumptions concerning the effectiveness of O2− transitions.

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References

  • Maclean, S., Duley, W. W., and Millar, T. J.: 1982,Astrophys. J. 256, L61.

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Authors and Affiliations

  1. Department of Applied Mathematics and Astronomy, University College, Cardiff, Wales, UK

    F. Hoyle, N. C. Wickramasinghe & N. L. Jabir

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  1. F. Hoyle
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  2. N. C. Wickramasinghe
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  3. N. L. Jabir
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Hoyle, F., Wickramasinghe, N.C. & Jabir, N.L. The extinction of starlight at wavelengths near 2200 Å. Astrophys Space Sci 92, 433–438 (1983). https://doi.org/10.1007/BF00651307

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  • DOI: https://doi.org/10.1007/BF00651307

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