Physics
Scientific paper
Oct 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.208..274n&link_type=abstract
Nature, Volume 208, Issue 5007, pp. 274-275 (1965).
Physics
7
Scientific paper
AN accurate extinction curve with a standard error of +/- 0.008m which has been derived for a region in the direction of Cygnus (looking along the spiral arm) from spectrophotometric observations at the Royal Observatory, Edinburgh1, shows a pronounced discontinuity in slope at 4300 Å. This feature as well as recent rocket observations2 rule out the possibility that the interstellar dust is made up of iron or ice particles. Hoyle and Wickramasinghe3 have suggested that graphite particles, formed on the surface of carbon stars, could be ejected into interstellar space by radiation pressure, and Wickramasinghe4 finds that such carbon particles may become covered with ice mantles. The wave-length 4300 Å is close to that at which the refractive index of graphite particles begins to change, the extinction of graphite being remarkably close to a 1/λ law in the region 0.8 <= λ-1 <= 2.3 and thereafter deviating from such a law more or less according to particle size5. Nandy and Wickramasinghe6 have shown that the observed extinction curve for Cygnus can be well reproduced by the assumption of graphite cores with radii less than ~ 0.06μ covered with ice mantles.
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