Correlations between the lambda 2200 feature, the diffuse lambda 4430 band, and E/B-V/

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Diffuse Radiation, Interstellar Extinction, Magellanic Clouds, Electrophotometry, Interstellar Radiation, Line Spectra, Spectral Line Width, Stellar Spectra

Scientific paper

The 2200 A extinction feature has been measured from ANS observations of 30 stars. For each star, the depth of the 2200 A feature is compared to E(B-V) and the equivalent width of the diffuse band 4430 A. A good correlation appears out to E(B-V) = 1.13. The various mechanisms for producing the diffuse and 2200 A features are discussed and a discriminatory test is put forward based on observations of the Magellanic Clouds.

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