Abstract
This is a review of the properties of the DIBs in relation to the different interstellar environments in which their carriers are located. It starts with a general survey of conditions in different regions of the interstellar medium. Comparisons of DIBs with each other show that there are considerable variations in relative strengths of absorption, but also have led to the concept of ‘families’ that vary together. The relation of DIB strengths to optical extinction gives a measure of the abundances of the carriers relative to the total amount of interstellar matter as well as to the dust grains. DIB strengths may be compared with gas-phase abundances of atoms and molecules to study their immediate relation to cloud conditions such as density. It is found that the strength of the strongest DIB, λ4430, does not vary with the cloud density, whereas for other DIBs studied the strength tends to decrease with density and depth into dark clouds, more rapidly for λ5780 than for λ5797.
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Somerville, W.B. (1995). Collective Behaviour of the Diffuse Interstellar Bands. In: Tielens, A.G.G.M., Snow, T.P. (eds) The Diffuse Interstellar Bands. Astrophysics and Space Science Library, vol 202. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0373-2_9
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