Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..34...19s&link_type=abstract
(Symposium on Solid State Astrophysics, Cardiff, Wales, July 9-12, 1974.) Astrophysics and Space Science, vol. 34, Apr. 1975, p.
Astronomy and Astrophysics
Astronomy
25
Far Ultraviolet Radiation, Interstellar Extinction, Spaceborne Astronomy, Light Curve, Light Scattering, Nebulae, Oao 2
Scientific paper
It was found earlier from OAO-2 data that considerable variability with direction in space is present in both the shape and level (relative to B-V color excess) of the interstellar extinction curve in the far ultraviolet. The star sigma Sco was shown to be a case of extremely low UV extinction, but there was some question of whether this could be due to scattered nebular light entering the large entrance slit of the Wisconsin spectrometer aboard OAO-2. We have obtained UV data on sigma Sco using Copernicus (OAO-3), which has an entrance slit on the order of 1,000 times smaller in projected area than that of OAO-2, so that the contribution to the signal from scattered nebular light would be correspondingly smaller. We find very good agreement with the extinction curve of Bless and Savage (1972), confirming the low UV extinction in the line of sight to sigma Sco.
Snow P. Jr. Th.
York Don G.
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