Does a 2,200 A hump observed in an artificial carbonaceous composite account for UV interstellar extinction

Astronomy and Astrophysics – Astronomy

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Carbon Stars, Interstellar Extinction, Interstellar Matter, Near Ultraviolet Radiation, Ultraviolet Astronomy, Absorption Spectra, Carbonaceous Chondrites, Hydrocarbons, Spectral Energy Distribution, Ultraviolet Absorption

Scientific paper

An investigation was carried out to test whether the 2200 A hump in the interstellar extinction curve could be due to hydrocarbons having conjugated double bonds. Carbonaceous materials were synthesized by injecting a plasmic gas mixture of hydrogen and carbon into a vacuum chamber. Extinction of the material was measured over the range 1900-7000 A. The extinction profile of the synthesized material clearly exhibits the 2200 A hump, the average value for the central wavelength being 2170 + or -30 A. The distribution of excited states in the plasma was well within the range reported for the photosphere of carbon stars.

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