Table 1
Literature values of the 14N/15N ratio from low-mass prestellar cores and protostars (top).
| Source | HCN | HNC | CN | NH3 | NH2D | N2H+ | Remarks |
|
|
|||||||
| L1544 | 140−360 a | 510 ± 70 b | > 700 c | 1000 ± 200 d | prestellar core | ||
| 69−154 e | > 27 e | ||||||
| L1498 | > 813 f | > 90 e | 476 ± 70 b | prestellar core | |||
| L183 | 140−250 a | prestellar core | |||||
| L1521E | 151 ± 16 f | prestellar core | |||||
| L1521F | > 51 e | 24−31 e | prestellar core | ||||
| Barnard 1 |
g
|
g
|
g
|
g
|
g
|
g
|
|
| NGC 1333 IRAS4 | > 270 c | protostar | |||||
| NGC 1333 DCO+ |
c
|
||||||
| NGC 1333 | 344 ± 173 h | ||||||
| L134N(S) |
c
|
||||||
| L1689N |
c
|
||||||
| Cha-MMS1 | 135 i | ||||||
|
|
|||||||
| IRAS 17233-3606 | 276 ± 62 j | HII region | |||||
| DR 21 | 159 ± 31 j | 243 ± 66 j | HII region | ||||
| Orion KL | 159 ± 40 j | 234 ± 47 j | |||||
| Orion Bar | 338 ± 311 j | 361 ± 141 j | PDR | ||||
Notes. For comparison, the most nearby sources from the galactic survey by Adande & Ziurys (2012) are listed as well (bottom).
Reference.
Hily-Blant et al. (2013a) – the range reflects spatial variations within the core;
Gerin et al. (2009) based on 15NH2D observations at the IRAM 30 m;
Bizzocchi et al. (2013), revised from the previously published value of 446 ± 71 (Bizzocchi et al. 2010);
Lis et al. (2010) based on observations of 15NH3 inversion lines with the Green Bank Telescope;
reported in Milam & Charnley (2012) based on Tennekes et al. (2006);
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