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Table 1
THEMIS model elemental abundance requirements (in ppm).
| Dust | C | C | C | O | Mg | Si | Fe | Fe | S | density | Md/MH |
| component | (a-C:H) | (a-C) | (total) | (metal) | (FeS) | (g/cm3) | |||||
|
|
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| Nano a-C | 13−4 | 130−140 | 143−144 | – | – | – | – | – | – | 1.60 | 1.7 × 10-3 |
| Large a-C:H/a-C | 45−39 | 5−13 | 50−52 | – | – | – | – | – | – | 1.51−1.57 | (6.0−6.3) ×10-4 |
| Large a-Sil/a-C | – | 13−22 | 13−22 | 110 | 45 | 32 | 16 | 3 | 3 | 2.19−1.94 | (5.1−4.5) ×10-3 |
Notes. Variations in the diffuse ISM dust emission and extinction (Ysard et al. 2015) can be explained with a range of a-C mantle depths (thin−thick, see text), which do not significantly affect the total carbon abundance.
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