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

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Abstract

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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Keywords

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