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Models of Reflection Nebulae

Published online by Cambridge University Press:  08 February 2017

T. P. Roark
Affiliation:
Rensselaer Polytechnic Institute, Troy, New York
J. Mayo Greenberg
Affiliation:
Rensselaer Polytechnic Institute, Troy, New York

Extract

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A Feasibility Study For an Observational Program was made to investigate models of reflection nebulae. Specifically, for a relatively simple model of an interstellar dust cloud with a source of illumination nearby, predictions of the color of the nebula, relative to the source color, at points along any radial direction from the source are sought. Furthermore, from these color differences, the possibility is studied of discriminating between the effects produced by the cloud-source-observer geometry and those due to the assumed optical properties of the scattering particles. If such discrimination is feasible, the types of observations that would be most useful in separating the effects must be known to the investigator.

Plane-parallel slab models similar to those of reference 1 in which the scattering particles are distributed isotropically and homogeneously were used. The scattering properties of the particles were assumed to be those obtained by using the Mie theory of electromagnetic scattering.

Type
Research Article
Copyright
Copyright © Kluwer Academic Publishers 1965

References

1. Carl, Schalen: Studies of Reflection Nebulae. Uppsala Obs. Ann., vol. 1, no. 9, 1945.Google Scholar
2. Greenberg, J. M.: The Optics of Interstellar Grains. Proceedings of the I.A.U. Symposium No. 24: Spectral Classification and Multicolor Photometry (Saltsjobaden, Sweden), 1964.Google Scholar
3. Oort, J. H.; and Van De Hulst, H. C.: Gas and Smoke in Interstellar Space. Bull. Astron. Inst. Netherlands, vol. 10, 1946, p. 187.Google Scholar
4.Whitford, A. E.: An Extension of the Interstellar Absorption Curve. Astrophys. J., vol. 107, 1948, p. 102.10.1086/144992CrossRefGoogle Scholar
5. Hoyle, Fred; and Wickramasinghe, N. C.: On Graphite Particles as Interstellar Grains. Roy. Astron. Soc., Monthly Notices, vol. 124, 1962, p. 417.10.1093/mnras/124.5.417CrossRefGoogle Scholar
6. Van De Hulst, H. C.: Light Scattering by Small Particles. John Wiley & Sons, Inc., 1957.10.1063/1.3060205CrossRefGoogle Scholar
7. Aller, L. H.; Faulkner, D. J.; and Norton, R. H.: Photoelectric Spectrophotometry of Selected Southern Stars. Astrophys. J., vol. 140, 1964, p. 1609.10.1086/148067CrossRefGoogle Scholar