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The nature of the 10 and 20 micrometer features in circumstellar dust shells

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In this paper we study the influence of model parameters adopted in radiative transfer computations on the shape of the 10 and 20 μm bands observed in IR spectra of Becklin-Neugebauer objects and O-rich giants and supergiants. The calculations show that besides the wavelength-dependence of the absorption efficiency the optical depth is the most important parameter. From the appearance of the 10 μm feature we can distinguish three different regions: emission, self-absorption and absorption. The most important effect demonstrated by the model computations is that an emission feature shows a weaker variation than an absorption feature if the optical depth is increased or decreased. Furthermore shells with central-peaked density distributions should exhibit stronger emission bands and weaker absorption bands than shells with a constant density.

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Henning, T. The nature of the 10 and 20 micrometer features in circumstellar dust shells. Astrophys Space Sci 97, 405–419 (1983). https://doi.org/10.1007/BF00653496

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  • Dust
  • Emission Band
  • Radiative Transfer
  • Optical Depth
  • Emission Feature