Table 3
Column densities and isotope ratios derived for 12CO and 13CO ice.
| Source | L(L⊙) | Distance (pc) | N 12CO 2.35 µm | N 12CO 4.67 µm | N 13CO 4.78 µm | 12C/13C 2.35 µm | 12C/13C 4.67 µm |
|---|---|---|---|---|---|---|---|
| B1-b | 0.2 | 293 | _ | 4.1 × 1018 | 2.5 × 1016 | _ | 162 ± 24 |
| TMC1–E | 0.7 | 142 | – | 8.1 × 1017 | 5.2 × 1015 | – | 156 ± 23 |
| TMC1-W | 0.7 | 142 | – | 8.2 × 1017 | – | – | – |
| B1-a-N | 1.5 | 293 | – | 1.2 × 1018 | 7.0 × 1015 | – | 171 ± 26 |
| B1-a-S | 1.5 | 293 | – | 1.1 × 1018 | 5.2 × 1015 | – | 205 ± 31 |
| Per-emb55-a | 1.8 | 293 | – | 1.2 × 1018 | 6.8 × 1015 | – | 177 ± 27 |
| Per-emb55-b | 1.8 | 293 | 7.9 × 1017 | 1.3 × 1018 | 8.2 × 1015 | 96 ± 14 | 152 ± 23 |
| L1527 | 3.1 | 142 | – | 2.2 × 1018 | 1.3 × 1016 | – | 171 ± 26 |
| B1-c | 3.2 | 293 | – | 5.0 × 1018 | 1.1 × 1017 | – | 47 ± 7 |
| EDJ183-a | 3.2 | 293 | – | 1.0 × 1018 | 6.8 × 1015 | – | 147 ± 22 |
| EDJ183-b | 3.2 | 293 | – | 9.4 × 1017 | 6.2 × 1015 | – | 151 ± 23 |
| Per-emb22 | 3.6 | 293 | – | 3.2 × 1018 | 1.1 × 1016 | – | 294 ± 44 |
| Ser-S68N-N | 6 | 435 | – | 1.9 × 1018 | 6.7 × 1015 | – | 278 ± 42 |
| Per-emb33 | 8.3 | 293 | – | 3.6 × 1018 | 8.0 × 1015 | – | 447 ± 67 |
| Per-emb35 | 9.1 | 293 | – | 9.5 × 1018 | – | – | – |
| Ser-SMM3 | 28 | 435 | – | 1.2 × 1018 | – | – | – |
| Per-emb27 | 36 | 293 | – | 3.4 × 1018 | 1.1 × 1016 | – | 306 ± 46 |
Notes. The main source of uncertainty in the derived ratios stem from the error on the band strength, the observational errors are negligible in contrast (~3%). The error on the band strength includes the change in the band strength due to temperature and due to a water-rich ice mixture. The error analysis is presented in detail in Appendix A.
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