Table 3
Isotopic ratios retrieved from line-intensity ratios, with Rc the frequency-corrected ratio: per transition this corresponds to 
and overall to Rc = Ra∕b, the error-weighted mean ratio.
| Isotopologues | Transition | Rc | RRT | R⊙ | Remarks | |
|---|---|---|---|---|---|---|
| C | 12CO/13CO | 2–1 | 17.0 ± 3.6 | |||
| 3–2 | 9.1 ± 1.9 | |||||
| 10.9 ± 1.7 | 10 | RRT from Ramstedt & Olofsson (2014). | ||||
| H12CN/H13CN | 2–1 | 8.4 ± 1.8 | ||||
| 3–2 | 9.0 ± 1.9 | |||||
| 4–3 | 2.4 ± 0.5 | H13CN(J = 4–3) is blended. | ||||
| 8.7 ± 1.3 | Excluding the 4–3 transitions. | |||||
| 12C/13C = 89.40 | ||||||
| Si | 28SiO/29SiO | 4–3 | 2.3 ± 0.5 | |||
| 5–4 | 3.2 ± 0.7 | |||||
| 6–5 | 3.2 ± 0.7 | |||||
| 7–6 | 2.5 ± 0.5 | |||||
| 8–7 | 3.1 ± 0.7 | |||||
| 2.8 ± 0.3 |  |
28Si/29Si = 19.69 | ||||
| 28SiO/30SiO | 4–3 | 4.0 ± 0.8 | ||||
| 5–4 | 4.3 ± 0.9 | |||||
| 6–5 | 4.2 ± 0.9 | |||||
| 7–6 | 4.1 ± 0.9 | |||||
| 8–7 | 4.0 ± 0.8 | |||||
| 4.1 ± 0.4 |  |
28Si/30Si = 29.87 | ||||
| 29SiO/30SiO | 4–3 | 1.7 ± 0.4 | ||||
| 5–4 | 1.4 ± 0.3 | |||||
| 6–5 | 1.3 ± 0.3 | |||||
| 7–6 | 1.6 ± 0.3 | |||||
| 8–7 | 1.3 ± 0.3 | |||||
| 1.4 ± 0.1 |  |
29Si/30Si = 1.517 | ||||
| O | 28Si16O/28Si17O | 4–3 | 76.3 ± 16.2 | |||
| 5–4 | 65.7 ± 13.9 | |||||
| 6–5 | 54.0 ± 11.5 | |||||
| 7–6 | 57.1 ± 12.1 | |||||
| 8–7 | 61.6 ± 13.1 | |||||
| 61.2 ± 5.8 |  |
16O/17O = 2632 | ||||
| 28 Si16 O/28 Si18 O | 4–3 | 38.1 ± 8.1 | ||||
| 5–4 | 47.9 ± 10.1 | |||||
| 6–5 | 30.6 ± 6.5 | |||||
| 7–6 | 24.9 ± 5.3 | |||||
| 31.5 ± 3.4 |  |
16O/18O = 498.8 | ||||
| 28 Si17 O/28 Si18 O | 4–3 | 0.5 ± 0.1 | ||||
| 5–4 | 0.7 ± 0.2 | |||||
| 6–5 | 0.6 ± 0.1 | |||||
| 7–6 | 0.4 ± 0.1 | |||||
| 0.5 ± 0.1 |  |
17O/18O = 0.190 | ||||
| C16 O/C17 O | 2–1 | – | ||||
| 3–2 | – | |||||
| – | > 200 | Non-detection of C17O emission. | ||||
| C16 O/C18 O | 2–1 | – | ||||
| 3–2 | – | |||||
| – | > 200 | Non-detection of C18O emission. | ||||
| S | 32 SO2 /34 SO2 | Overall spectrum | 21.6 ± 8.5 | 32S/34S = 22.1 | RRT from Danilovich et al. (2016) | |
Notes. When available, we also list the isotopologue abundance ratios RRT obtained from radiative transfer modelling. Solar (elemental) isotopic ratios R⊙ are taken from Asplund et al. (2009, see their Table 3). See text for details.
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