Encyclopedia of Astrobiology

2015 Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James (Jim) CleavesII, Daniele L. Pinti, José Cernicharo Quintanilla, Daniel Rouan, Tilman Spohn, Stéphane Tirard, Michel Viso

Reddening, Interstellar

Reference work entry
DOI: https://doi.org/10.1007/978-3-662-44185-5_1355


Because the extinction by  interstellar dust grains depends upon wavelength, with greater extinction at shorter wavelengths, starlight passing through the interstellar medium is reddened with respect to the light emitted by the source star. The reddening of a star is customarily quantified by astronomers through “selective extinction,” defined as
$$ {E}_{B-V}=\left(B-V\right)-{\left(B-V\right)}_0 $$
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References and Further Reading

  1. Whittet DCB (2003) Dust in the galactic environment, 2nd edn. Institute of Physics, BristolGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.University of MassachusettsAmherstUSA