Table 1
Dust model abundances and dust-to-gas mass ratios.
| Small amorphous carbon grains (a< 100 nm) | ||||||||
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| Mantle thickness (nm) | ρ (g/cm3) | M d / M H |
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|
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| 0 | 1.3 | 0.14 × 10-2 | 0 | 116.6 | 116.6 | |||
| 5 | 1.6 | 0.17 × 10-2 | 123.9 | 19.6 | 143.5 | |||
| 7.5 | 1.6 | 0.17 × 10-2 | 130.2 | 13.2 | 143.5 | |||
| 10 | 1.6 | 0.17 × 10-2 | 133.9 | 9.6 | 143.5 | |||
| 20 | 1.6 | 0.17 × 10-2 | 139.9 | 3.6 | 143.5 | |||
| 30 | 1.6 | 0.17 × 10-2 | 141.8 | 1.7 | 143.5 | |||
|
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| Big amorphous carbon grains (100 ≲ a ≲ 200 nm) | ||||||||
|
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| Mantle thickness (nm) | ρ (g/cm3) | Md/MH |
|
|
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|||
|
|
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| 0 | 1.30 | 0.52 × 10-3 | 0 | 43.2 | 43.2 | |||
| 5 | 1.48 | 0.59 × 10-3 | 3.67 | 45.6 | 49.3 | |||
| 7.5 | 1.51 | 0.60 × 10-3 | 5.4 | 44.9 | 50.4 | |||
| 10 | 1.53 | 0.61 × 10-3 | 7.1 | 43.9 | 51.0 | |||
| 20 | 1.57 | 0.63 × 10-3 | 13.0 | 39.3 | 52.3 | |||
| 30 | 1.59 | 0.63 × 10-3 | 18.0 | 34.7 | 52.7 | |||
|
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| Amorphous silicate grains (100 ≲ a ≲ 200 nm) | ||||||||
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| Mantle thickness (nm) | ρ (g/cm3) | Md/MH |
|
|
|
|
|
|
|
|
||||||||
| 0 | 2.95 | 0.68 × 10-2 | 44.6 | 62.6 | 152.9 | 26.7 | 3.8 | 0 |
| 5 | 2.19 | 0.51 × 10-2 | 32.1 | 45.1 | 110.1 | 19.3 | 2.8 | 12.8 |
| 7.5 | 2.04 | 0.47 × 10-2 | 29.4 | 41.3 | 100.9 | 17.6 | 2.5 | 17.6 |
| 10 | 1.94 | 0.45 × 10-2 | 27.6 | 38.7 | 94.5 | 16.5 | 2.4 | 22.1 |
| 15 | 1.82 | 0.42 × 10-2 | 25.1 | 35.2 | 86.1 | 15.1 | 2.2 | 30.3 |
| 20 | 1.75 | 0.41 × 10-2 | 23.5 | 33.0 | 80.5 | 14.1 | 2.0 | 38.2 |
Notes. The first column lists the aromatic-rich carbon mantle thickness, the second column the grain density averaged over the size distribution, and the other columns the elemental abundances (in ppm) of C, Si, Mg, O, Fe, and S within the grains. For the carbonaceous grains, we distinguish between carbon in aromatic-rich (mantle) and aliphatic-rich (core) forms. The carbons included in the silicates are those of the aromatic-rich mantles.
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