Physics
Scientific paper
Jul 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967natur.215..495s&link_type=abstract
Nature, Volume 215, Issue 5100, pp. 495-496 (1967).
Physics
5
Scientific paper
THERE is evidence1 that the profile of the unidentified interstellar absorption band at 4430 Å is constant over a range of galactic longitudes. This band is the strongest of a number of apparently similar bands centred on wavelengths of 6180 Å, 4890 Å and 4760 Å. The band at 6180 Å was first noticed by Wilson2, who speculated as to an interstellar origin. The second band, at 4890 Å, was discovered independently by Wilson3 and by Butler and Seddon4, while the third was tentatively identified as interstellar by Merrill in private correspondence with Beals5. The only evidence presented so far about the interstellar nature of these bands, apart from studies of correlation of strengths with those of known interstellar absorptions, comes from Merrill and Humason6, who have shown that the position of the 4430 Å band is stationary with respect to stellar absorption lines in the spectrum of an early type binary star. Strength correlation is difficult for all these bands because of their weakness and width, and has only been attempted for the band at 4430 Å. For the same reasons profile determination is difficult, but may well be crucial in the identification of their origin.
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