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Table 3.
Characteristic molecular lifetimes (in years) in the lobes under different radiation fields and shielding conditions.
| External interstellar radiation field (ISRF) |
Hypothetical central white dwarf radiation field |
||||||
|---|---|---|---|---|---|---|---|
| AV = 0 | AV = 3mag | AV = 3mag | AV = 0 | AV = 3mag | AV = 0 | AV = 3mag | |
| Molecule | no grains | ISM grains | big grains | Teff = 20 kK | Teff = 20 kK | Teff = 60 kK | Teff = 60 kK |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
| HC3N | 4.5E+0 | 7.9E+3 | 5.3E+1 | 1.27E−1 | 3.78E+2 | 7.53E−3 | 3.02E+1 |
| OCS | 6.8E+0 | 8.1E+3 | 7.4E+1 | 2.04E−1 | 3.74E+2 | 1.26E−2 | 3.26E+1 |
| SO | 7.5E+0 | 2.2E+4 | 7.8E+1 | 3.61E−1 | 1.93E+3 | 1.34E−2 | 1.10E+2 |
| H2S | 1.0E+1 | 2.1E+4 | 1.1E+2 | 3.24E−1 | 1.10E+3 | 1.62E−2 | 8.64E+1 |
| CH3CN | 1.1E+1 | 7.4E+4 | 1.3E+2 | 3.57E−1 | 5.03E+3 | 1.11E−2 | 2.96E+2 |
| SO2 | 1.3E+1 | 4.0E+4 | 1.4E+2 | 5.32E−1 | 2.65E+3 | 1.84E−2 | 1.81E+2 |
| HCN | 1.9E+1 | 1.6E+5 | 2.3E+2 | 6.55E−1 | 1.13E+4 | 2.04E−2 | 6.59E+2 |
| C2H | 2.0E+1 | 4.5E+4 | 2.4E+2 | 1.14E+0 | 2.56E+3 | 3.90E−2 | 1.77E+2 |
| SiO | 2.0E+1 | 4.3E+4 | 2.4E+2 | 6.09E−1 | 2.20E+3 | 2.81E−2 | 1.64E+2 |
| H2CO | 2.2E+1 | 3.4E+4 | 2.4E+2 | 7.40E−1 | 1.69E+3 | 3.72E−2 | 1.41E+2 |
| NH3 | 2.2E+1 | 4.1E+4 | 2.0E+2 | 7.43E−1 | 2.38E+3 | 3.37E−2 | 2.03E+2 |
| CH3OH | 2.3E+1 | 6.5E+4 | 2.7E+2 | 8.23E−1 | 3.23E+3 | 2.87E−2 | 2.51E+2 |
| CH3NH2 | 4.4E+1 | 4.2E+4 | 3.4E+2 | 1.31E+0 | 2.27E+3 | 1.10E−1 | 2.04E+2 |
| CN | 6.1E+1 | 1.6E+6 | 7.4E+2 | – | – | – | – |
| CO | 1.3E+2 | 1.0E+7 | 1.6E+3 | – | – | – | – |
| H2 | 5.6E+2 | 1.1E+8 | 6.7E+3 | – | – | – | – |
| HCO+ | 5.9E+3 | 2.6E+8 | 7.1E+4 | 2.84E+2 | 7.88E+7 | 4.58E+0 | 1.35E+6 |
Notes. Based on Heays et al. (2017). CO and H2 are subject to significant self-shielding in spectral lines.
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