Physics
Scientific paper
Sep 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.223.1046h&link_type=abstract
Nature, Volume 223, Issue 5210, pp. 1046-1048 (1969).
Physics
11
Scientific paper
IT was shown by Whitford1 and confirmed by Nandy2 that, over the visible part of the spectrum, the wavelength dependence of interstellar obscuration, in magnitudes against reciprocal wavelength, can be well represented by two intersecting straight lines. Because the change in slope of the extinction law is near the broad interstellar absorption band at 4430 Å, the question arises as to whether the observed ``corner'' is associated with this band or is a separate feature of the extinction law. If the latter, it is important to know how rapid is the change of slope and precisely at what wavelength it occurs, for a sufficiently sharp corner would require that the existing theories of extinction which are based on classical scattering by interstellar grains be modified. It is also of some interest to see if the linearity of the two parts of the curve holds good at the resolution necessary to resolve the interstellar band. The extinction law has therefore been observed over a reciprocal wavelength range about half that used by Nandy but with the density of measured points improved by a factor of thirty and the resolution by a factor of ten.
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