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Some Problems of Interstellar Grains

  • J. Mayo Greenberg (a1) and A. C. Lind (a1)

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The Interactions of Grains With Radiation show up either as modifications of the radiation field (scattering, extinction) by grains or as modifications of grains by the radiation. The principal effects on grains are to control their temperature and to exert forces (radiation pressure). This paper presents some radiation pressure calculations which may be pertinent to the problem of propulsion of grains outward from very hot, bright stars or more generally OB complexes. The radiation force is equal to the rate of transfer of momentum to the grain, which is equal, in turn, to the net rate of loss of momentum in the incident beam of electromagnetic radiation.

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References

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1. Boggess, A. III; and Borgman, J.: Interstellar Extinction in the Middle Ultraviolet. Astrophys. J., vol. 140, 1964, p. 1636.
2. Greenberg, J. M.: The Optics of Interstellar Grains. Proceedings of the I.A.U. Symposium No. 24: Spectral Classification and Multicolor Photometry. (Saltsjobäden, Sweden), 1964.
3. Hoyle, F.; and Wickramasinghe, N. C.: On Graphite Particles as Interstellar Grains. Roy. Astron. Soc., Monthly Notices, vol. 124, 1962, p. 417.
4. Johnson, H. L.; and Borgman, J.: The Law of Interstellar Extinction. Bull. Astron. Inst. Netherlands, vol. 17, 1963, p. 115.
5. Whitford, A. E.: The Law of Interstellar Reddening. Astron. J., vol. 63, 1958, p. 201.
6. Wickramasinghe, N. C.; and Guillaume, C.: Interstellar Extinction by Graphite Grains. Nature, vol. 207, 1965, p. 366.

Some Problems of Interstellar Grains

  • J. Mayo Greenberg (a1) and A. C. Lind (a1)

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