Table 1
Elemental abundances adopted in dust-free and dusty models.
| Q = 0 (dust-free) | Q = Qref ≡ 6 × 10−3 | ||
|---|---|---|---|
| Element | Gas | Gas | Grain |
| H | 1.00 | 1.00 | 0.00 |
| He | 1.00(−1) | 1.00(−1) | 0.00 |
| C | 3.55(−4) | 1.92(−4) | 1.63(−4) |
| N | 7.94(−5) | 7.94(−5) | 0.00 |
| O | 4.42(−4) | 3.02(−4) | 1.40(−4) |
| Mg | 3.70(−5) | 0.0 | 3.70(−5) |
| Si | 3.67(−5) | 3.03(−6) | 3.37(−5) |
| S | 1.86(−5) | 1.86(−5) | 0.00 |
| Fe | 3.23(−5) | 1.50(−8) | 3.23(−5) |
Notes. The last two columns give the distribution of elemental abundances for a standard dust-to-gas ratio Qref ≡ 6 × 10−3. For dusty models with a different dust-to-gas ratio, total elemental abundances are kept constant and elemental abundances in the grains are reduced by the same factor. Total elemental abundances and the elemental abundance in the grains are taken from Flower & Pineau des Forêts (2003) where carbon and hydrogen locked in PAH are assumed to be released in the gas-phase for all models. Numbers in parentheses are powers of 10.
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