Fig. 4
Peak positions of main emission features associated with crystalline olivine grains (9.8, 11, 16.2, 23–24, and 33 μm) as a function of the Fe fraction. Black circles, red squares, and green pentagons correspond to aerosol measurements of the pure forsterite, Mg-, and Fe-rich samples, respectively (Tamanai et al. 2006; Tamanai & Mutschke 2010). Hatched regions correspond to the range of peak positions in the observed spectra of HD 69830, HD 113766 A, ID 8, and HD 169666.
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