Fig. 15.
Star with luminosity, L ∼ 3300 L⊙ represented by a black body with Teff ∼ 5900K. The dust shells, assuming they absorb and emit as black bodies represented by the blue curves with T = 50 K, 40 K, 30 K, and 20 K. The red curves represent, in each case, the sum of the blackbody spectra of the star and shell. The dashed vertical line is indicated at 22 µm.
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