Interstellar Extinction and Diffuse Absorption Features
Part of the
Astrophysics and Space Science Library
book series (ASSL, volume 55)
The equivalent width of the λ 2175 Å band, W 2175, well known as the big bump in the interstellar extinction curves, has been found to be closely correlated with the colour excess E B-V as well as with the extinction differences E 8−6 and E 8−6 defined to characterize quantitatively the steep slopes of the extinction curves in the far ultraviolet.
The equivalent widths of the λλ 5780 and 5797 Å diffuse lines show good correlation with E B-V . The correlations of W 5780 and W 5797 with E 8−6 resp. E 9−7 are, however, rather weak. Correlations between W 2175 and W 5780 and between W 2175 and W 5797 are indicated.
The results have been qualitatively interpreted in favour of the dust model consisting of a mixture of small silicate grains and larger silicate grains coated by molecular mantles.
KeywordsEquivalent Width Interstellar Extinction Extinction Curve Dust Model Visual Portion
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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