The planetary nebula BD +30°3639: the infrared spectrum during post-AGB stellar evolution

  title={The planetary nebula BD +30°3639: the infrared spectrum during post-AGB stellar evolution},
  author={Ralf Siebenmorgen and Albert A. Zijlstra and Endrik Kruegel},
  journal={Monthly Notices of the Royal Astronomical Society},
We present a radiative-transfer calculation which reproduces the infrared spectrum of the planetary nebula BD~+30$^{\circ}$3639. We calculate the transfer process through absorption and scattering in a spherical-symmetric multi-grain dust shell. The emission of transiently heated particles is taken into account, as well as polycyclic aromatic hydrocarbons. We obtain an acceptable fit to most of the spectrum, including the PAH infrared bands. At submillimetre wavelengths the observed emission is… 
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