Table 8
Isotopic ratios.
| Ratio | Species | Source | ||||
|---|---|---|---|---|---|---|
| 15194–5115 | 15082–4808 | 07454–7112 | IRC +10216 | Solar(b) | ||
| 12C/13C | HC3N | 4.9(0.5) | 31.0(3.5) | 21.0(2.2) | ||
| C4H | 10.4(1.5) | – | – | 45(12)(1) | ||
| HNC | 5.0(0.5) | – | – | ≥ 38(2) | ||
| SiC2 | 5.8(0.6) | – | – | 37(5)(1), 50(7)(1), 41(4)(1) | ||
| C3N | 5.9(0.6) | – | – | 35(15)(1) | ||
| Average | 6.4(0.6) | 31.0(3.5) | 21.0(2.2) | 45(3)(1) | 89 | |
| 32 S/34S | SiS | 19(4) | 28(8)(a) | 21(4) | 18.9(1.3)(3) | 22 |
| 34S/33S | CS | 4.8(1.0) | 6.1(1.3) | 5.4(1.0) | 5.2(0.4)(3) | 5.5 |
| 32S/33S | [32S/34S]×[34S/33S] | 93(28) | 127(44) | 115(29) | 93(10)(3) | 125 |
| 28 Si/29Si | SiS | 16.8(2.1) | 16(3)(a) | 16(7) | 17.2(1.1)(3) | 20 |
| 29 Si/30Si | SiO | 1.3(0.2) | 1.4(0.2) | 1.4(0.3) | ||
| SiS | – | 2.2(0.5) | 1.8(0.8) | |||
| Average | 1.3(0.2) | 1.8(0.3) | 1.6(0.4) | 1.46(0.11)(3) | 1.5 | |
| 28Si/30Si | SiS | – | – | 28(12) | 24.7(1.8)(3) | 30 |
| [28Si/29Si]×[29Si/30Si] | 21.8(3.2) | 22(5) | 21(9) | |||
Notes. The values marked (a) are from abundance ratios, and the others are from line intensity ratios. The multiple number of carbon atoms present in a molecule has been taken into account when calculating the 12C/13C ratio from HC3N, C4H, and C3N. For IRC +10216, isotopic ratios are taken from (1)Cernicharo et al. (2000), (2)Kahane et al. (1988), and (3)He et al. (2008). (b)Solar values are from Asplund et al. (2009). The values given in parentheses are the estimated overall uncertainties.
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