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HandWiki. Extinction. Encyclopedia. Available online: https://encyclopedia.pub/entry/29910 (accessed on 18 October 2026).
HandWiki. Extinction. Encyclopedia. Available at: https://encyclopedia.pub/entry/29910. Accessed October 18, 2026.
HandWiki. "Extinction" Encyclopedia, https://encyclopedia.pub/entry/29910 (accessed October 18, 2026).
HandWiki. (2022, October 18). Extinction. In Encyclopedia. https://encyclopedia.pub/entry/29910
HandWiki. "Extinction." Encyclopedia. Web. 18 October, 2022.
Extinction
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The content is sourced from: https://handwiki.org/wiki/Astronomy:Extinction

In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer. Interstellar extinction was first documented as such in 1930 by Robert Julius Trumpler. However, its effects had been noted in 1847 by Friedrich Georg Wilhelm von Struve, and its effect on the colors of stars had been observed by a number of individuals who did not connect it with the general presence of galactic dust. For stars that lie near the plane of the Milky Way and are within a few thousand parsecs of the Earth, extinction in the visual band of frequencies (photometric system) is roughly 1.8 magnitudes per kiloparsec. For Earth-bound observers, extinction arises both from the interstellar medium (ISM) and the Earth's atmosphere; it may also arise from circumstellar dust around an observed object. Strong extinction in earth's atmosphere of some wavelength regions (such as X-ray, ultraviolet, and infrared) is overcome by the use of space-based observatories. Since blue light is much more strongly attenuated than red light, extinction causes objects to appear redder than expected, a phenomenon referred to as interstellar reddening.

circumstellar dust blue light interstellar medium

References

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  12. R(Ks) is, mathematically likewise, A(Ks)/E(J−Ks)
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