Table 4
Isotopic abundance ratios.
| Isotopic ratio | Species | Transition | I19312 | Nova 1670(b) | IRC+10216(c) | Orion KL(d) | Solar(e) | |
|---|---|---|---|---|---|---|---|---|
| Narrow | Broad | |||||||
| 12C/13C | HCO+/H13CO+ | J=1–0 | 1.9: | 12.2: | 2.5: | 45 ± 3 | >74.9 | 89.3 |
| HCN/H13CN | J=1–0 | (a)98: | 23.8: | 2.0: | >9.9 | |||
| >6.1 | ||||||||
| HNC/HN13C | J=1–0 | 17.4: | … | 6.2: | >67.3 | |||
| 14N/15N | HCN/HC15N | J=1–0 | (a)209.0:>70.0 | >35.4 | 12.8: | >4400 | >42.5 | 272.0 |
| 16O/18O | HCO+/HC18O+ | J=1–0 | 14.2: | >13.7 | 53.1: | 1260 ± 288 | >1613.5 | 498.8 |
| 16O/17O | HCO+/HC17O+ | J=1–0 | >66.6 | >17.3 | 840 ± 200 | >2039.0 | 2680.6 | |
| 18O/17O | C18O/C17O | J=2–1 | (a)3.2:>2.9 | (a)2.5:>2.4 | 6.7 | 0.7 ± 0.2 | 21.5 ± 21.6 | 5.4 |
| 13CO/C17O | 13CO/C17O | J=2–1 | (a)14.0:>10.5 | (a)27.8:>26.5 | 286.5 | 18.7 ± 4.4 | 5.9 ± 1.7 | 30.0 |
| 13CO/C18O | 13CO/C18O | J=2–1 | (a)4.3:>3.6 | (a)11.3:>10.8 | 52.1 | 28 ± 6 | 47.6 ± 13.5 | 5.6 |
| H13CO+/HC18O+ | J=1–0 | 7.7 ± 1.4 | >1.5 | 86.5 | 8.1 ± 2.3 | |||
| 28Si/30Si | 28SiO/30SiO | J=2–1 | 36.6: | 7.1: | 8.9: | >22 | 37.4 ± 1.2 | 29.9 |
| 29Si/30Si | 29SiO/30SiO | J=2–1 | 3.2 ± 4.4 | 0.8 ± 0.2 | 1.2 | 1.45 | 2.5 ± 0.1 | 1.5 |
Notes. Symbol (:) means uncertain measurements due to uncertain optical depths of the main lines.(a) The optical depth effects have been corrected (see Sect. 3.4). The row below gives the lower limits obtained by the velocity-integrated intensity ratios. (b) Taken from Kamiński et al. (2017). (c) Taken from Kahane et al. (2000).(d) Taken from Sutton et al. (1985) and Frayer et al. (2015).(e) Taken from Lodders (2003).
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