Table 5
Isotopic ratios in carbon and nitrogen obtained in prestellar cores are compared to model predictions.
| Ratio | Source | Observed | Models§ | Comments | |||
|---|---|---|---|---|---|---|---|
| value† | (1) | (2) | (3) | (4) | |||
| HCN/H13CN | L1498 | 45 ± 3 | – | – | – | 114–168 | This work |
| B1 | 30 |
(5) | |||||
| HCN/HC15N | L1544 | 140–360‡ | 254 | 37–195 | 202 | 334–340 | (6) |
| L183 | 140–250‡ | (6) | |||||
| L1498 | 338 ± 28 | This work | |||||
| B1 | 165 |
(5) | |||||
| H13CN/HC15N | L1544 | 2.0–4.5 | – | – | – | 1.9–3.0 | (6) |
| L183 | 2.0–3.7 | (6) | |||||
| L1498 | 7.5 ± 0.8 | This work | |||||
| B1 | 5.5 ± 0.8 | (5) | |||||
| CN/13C N | B1 | 50 |
– | – | – | 63 – 84 | (5) |
| CN/C15N | L1544 | 510 ± 70‡ | 252 | – | 409 | 334–337 | (3) |
| L1498 | 476 ± 70‡ | (3) | |||||
| B1 | 240 |
(5) | |||||
| 13C N/C15N | L1544 | 7.5 ± 1.0 | – | – | – | 4.0–5.3 | (3) |
| L1498 | 7.0 ± 1.0 | (3) | |||||
| B1 | 4.8 ± 3.3 | (5) | |||||
| HNC/HN13C | B1 | 20 |
– | – | – | 121–180 | (5) |
| HNC/H15N C | B1 | 75 |
237 | – | – | 332–335 | (5) |
| HN13C/H15N C | B1 | 3.8 ± 1.6 | – | – | – | 1.3–2.8 | (5) |
Notes. (§) Steady-state isotopic ratios from the following models: (1) Terzieva & Herbst (2000), (2) Wirström et al. (2012), (3) Hily-Blant et al. (2013b), and (4) Roueff et al. (2015). The nitrogen isotopic ratios have been rescaled according to the elemental value of the local ISM, 14N∕15N = 330 ± 30. (†) Observed values from (3) Hily-Blant et al. (2013b), (5) Daniel et al. (2013), (6) Hily-Blant et al. (2013a), and this work. (‡) Values computed assuming 12C/13C = 68.
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