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Table 1.
Four sources analysed in this work with the isotopic carbon ratios derived by Justtanont et al. (2013) and the observed periods with the following references: 1 – Olivier et al. (2001); 2 – Engels et al. (2015); 3 – Suh & Kim (2002); 4 – van Langevelde et al. (1990); 5 – Groenewegen (2022); and 6 – Wolak et al. (2013).
| Source name | 12C/13C | P [days] | Ref. |
|---|---|---|---|
| RAFGL 5379 | 27±11 | 1440 | 1 |
| OH 26.5+0.6 | 30±16 | 1591 | 2 |
| 1559±7 | 3 | ||
| 1589±42 | 4 | ||
| OH 30.1−0.7 | 4±1 | 2171 | 1 |
| 1952±46 | 5 | ||
| 2013±243 | 4 | ||
| OH 127.8−0.0 | 2±1 | 1590 | 2 |
| 1600 | 6 |
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