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Table D.1
Direct measurements of the 14N/15N isotopic ratio in the local ISM (at a distance d to the Sun), derived from direct X14N/X15N abundance ratios using various molecular carriers and techniques.
| Carrier | Environment | Source | Gal. coord. | d (pc) | 14N/15N | Reference |
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| HCN | Diffuse | B0415+379† | 161.7, –8.8 | <1000 | 244(89) | Lucas & Liszt (1998) |
| HCN | Diffuse | B0415+379† | 161.7, –8.8 | <1000 | 282(37) | Lucas & Liszt (1998) |
| CN | Diffuse | HD 73882 | 260.2, 0.64 | <1000 | 234(35) | Ritchey et al. (2015) |
| CN | Diffuse | HD 154368 | 350.0, 3.22 | <1000 | 452(107) | Ritchey et al. (2015) |
| CN | Diffuse | HD 169454 | 17.5, –0.67 | <1000 | 283(22) | Ritchey et al. (2015) |
| CN | Diffuse | HD 210121 | 56.9,-44.5 | <1000 | > 312 | Ritchey et al. (2015) |
| NH3 | Prestellar | Barnard 1 | 159.2, –20.1 | 235 | 334(17) | Lis et al. (2010) |
| NH3 | Prestellar | Barnard 1 | 159.2, –20.1 | 235 | 307(50) | Daniel et al. (2013) |
| NH2D | Prestellar | Barnard 1 | 159.2, –20.1 | 235 | 255(80) | Daniel et al. (2013) |
| N2H+ | Prestellar | I16923E | 353.9, 15.8 | 125 | 365(135) | Daniel et al. (2016) |
| N2H+ | Prestellar | L1544 | 178.0, –9.7 | 150 | 1080(160) | Bizzocchi et al. (2013) |
| CN | Disk | TW Hya | 278.7, 23.0 | 59.5 | 323(30) | This work |
| CN | – | Interpolation‡ | – | 0 | 290 ± 40 | Adande & Ziurys (2012) |
Notes. Uncertainties are at the 1σ level. These data correspond to Fig. 4.
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