Table 8
Dust composition of the Spitzer IRS spectrum, in two wavelength regions.
| Parameter | Grain | Mass fraction/ | Mass fraction/ |
| size [μm] | PAH intensity | PAH intensity | |
| (5–17 μm) | (17–35 μm) | ||
|
|
|||
| χ 2 | 61.8 | 91.1 | |
| Amorph. Olivine | 0.1 |
|
|
| Amorph. Olivine | 1.5 |
|
|
| Amorph. Olivine | 6.0 | – | – |
| Amorph. Pyroxene | 0.1 | – | – |
| Amorph. Pyroxene | 1.5 | – | – |
| Amorph. Pyroxene | 6.0 | – | – |
| Cryst. Forsterite | 0.1 |
|
|
| Cryst. Forsterite | 1.5 |
|
– |
| Cryst. Enstatite | 0.1 | – |
|
| Cryst. Enstatite | 1.5 | – | – |
| Amorph. Silica | 0.1 |
|
– |
| Amorph. Silica | 1.5 |
|
|
| Amorph. Silica | 6.0 | – |
|
|
|
|||
| PAH 6.2 |
|
– | |
| PAH 7.6 |
|
– | |
| PAH 7.8 |
|
– | |
| PAH 8.6 |
|
– | |
| PAH 11.3 |
|
– | |
| PAH 12.7 |
|
– | |
Notes. Relative silicate mass fractions and their errors are given in percent. The mass fractions marked as non-detections are either fitted as 0% or have <1σ significance. The numbers indicated for PAHs are relative intensities compared to the normalised PAH model profile from Hony et al. (2001).
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