Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..34...39d&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
Astrophysics
4
Absorption Spectra, Cosmic Dust, Far Ultraviolet Radiation, Interstellar Extinction, Spectral Line Width, Astronomical Models, Diffuse Radiation, Interstellar Matter, Light Curve
Scientific paper
The equivalent width of the 2175 A band, W(2175), well known as the big bump in the interstellar extinction curves, has been found to be closely correlated with the color excess E(B-V) as well as with the extinction differences E(8-6) and E(9-7) defined to characterize quantitatively the steep slopes of the extinction curves in the far ultraviolet. The equivalent widths of the 5780 and 5797 A diffuse lines show good correlation with E(B-V). Correlations between W(2175) and W(5780) and between W(2175) and W(5797) are indicated. The results have been qualitatively interpreted in favor of the dust model consisting of a mixture of small silicate grains and larger silicate grains coated by molecular mantles.
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