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Table 1
Envelope parameters and assumptions for IRC +10216 in this study.
| 1. Shape | Spherical | |
| 2. Mass-loss rate | 1.5(−5) M⊙ yr-1 | |
| 3. Envelope expansion velocity | 14.5 km s-1 | |
| 4. Radiation field | Standard interstellar radiation field (Draine 1978), isotropic incidence | |
| 5. Dust and gas shells in the outflow | Ignored | |
| 6. Grain surface reactions | Ignored | |
| 7. Polycyclic aromatic hydrocarbons (PAHs) | Ignored | |
| 8. Gas density distribution | Falls as r-2, where r is the distance from the central star | |
| 9. Chemical evolution | Kinetic equations solved as a function of radius as material traverses the CSE | |
| 10. H2 | Fully self-shielded, no photodissociation | |
| 11. Parent species | See Table 2 | |
| 12. T, AV , and gas density | See Fig. 2 | |
| 13. Distance | 150 pc (De Beck et al. 2012) |
Notes. a(b) = a × 10b.
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