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Table 3
Oxygen budget of various species in ppm assuming overall [O] = 575 ppm.
| Form | Species | Diffuse clouds | Low-mass YSO | High-mass YSO | Shocks | Comets |
|---|---|---|---|---|---|---|
| Dust | Refr. Dust | 140 | 140 | 140 | 140 | 140 |
| Refr. Organics | − | − | − | − | 50 | |
| Gas | O | 320 | ? | ? | 30 | − |
| H2O | <1 | 40 | ≤62 | 80 | − | |
| CO | 1 | 100 | 100 | 100 | − | |
| CO2 | − | <1 | <1 | <1 | − | |
| O-other | − | − | − | − | − | |
| Ice | H2O | <2 | 38 | 31 | − | 323 |
| CO | <1 | 10 | 3 | − | 10 | |
| CO2 | <1 | 24 | 8 | − | 30 | |
| CH3OH | <1 | 3 | 4 | − | 1 | |
| O-other | <1 | 1 | 1 | − | 21 | |
| UDO | 115 | 219 | 226 | 225 | − | |
Notes. See Appendix G for references to the adopted numbers in this table and their uncertainties. The ice abundances for protostars are as observed, without hiding ices in large grains.
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