Abstract
The ratio of total to selective absorbtion, R, has been found to remain constant as dust is processed in clouds from low to high density, through H II regions and open clusters, and returned to the interstellar medium. R has the same value in dense dust clouds as it has in H II regions of different ages. Variations in R values obtained from stars in H II regions may be due to errors in special type classification. Globular cluster diameters show no tendency to increase with distance from the Sun when R=3.2 is used. Large grains evidently do not exist in the interstellar medium. There is no evidence for neutral extinction in the Galaxy at large.
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© 1976 D. Reidel Publishing Company, Dordrecht, Holland
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Sherwood, W.A. (1976). On the Ratio of the Total to Selective Absorption. In: Wickramasinghe, N.C., Morgan, D.J. (eds) Solid State Astrophysics. Astrophysics and Space Science Library, vol 55. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1884-5_1
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