Table 2
Isotopic ratios resulting from our LTE analysis with CASSIS and directly from line ratios.
| Isotopologues | Column-density | 3σ ratio | Line ratio |
| ratio | range | and 3σ error | |
|
|
|||
| 12C/13C = 3.8 ± 1.0 [89.3]⊙ | |||
|
|
|||
| HC3N, H13CCCN, HC13CCN+HCC13CN | 4.3 | 3.3–5.6 | 4.1±1.1 |
| CCH, 13CCH, C13CH | 3.0 | 2.2–3.4 | |
| CN, 13CNa | 2.3 | 2.1–2.6 | |
| CS, 13CS | 4.6 | 3.1–7.0 | 3.4±0.2 |
| HCO+, H13CO+ | 2.5 | 1.8–4.2 | 2.1±0.1 |
| HCN, H13CN | 2.0 | 1.6–2.6 | 1.7–2.7b |
| CO, 13CO | 4.0 | 3.0–5.3 | |
| CH3OH, 13CH3OHc | 3.8 | 2.9–4.9 | 3.8±0.6 |
| CH3CN, 13CH3CNa,c | 1.5 | 1.2–2.8 | 4.3±0.1 |
H2CO, H COd |
6.5 | 4.4–9.7 | 4.0±0.2 |
| HNC, HN13C | 6.2 | 4.3–8.5 | 2.1±0.1 |
| C18O, 13C18O | 5.0 | 2.5–16.6 | |
|
|
|||
| 13C/14C > 141 | |||
|
|
|||
| H13CN, H14CN | >142 | ||
| 13CO, 14CO | >72 | ||
|
|
|||
| 14N/15N = 20 ± 10 [441]⊙e | |||
|
|
|||
| CN, C15Nb | 44.8 | 24.0–190.0 | |
| N2H+, 15NNH+, N15NH+ | 14.6 | >5.3 | 16.2±9.5 |
| HCN, HC15N | 12.8 | 10.1–17.0 | 11.1±0.3 |
| HNC, H15NC | 30.8 | 15.2–67.0 | 15.9±1.7 |
| NS, 15NS | >17.4 | ||
HC3N, HC N |
>7.6 | ||
| 13CN, 13C15N | >37.0 | ||
| H13CN, H13C15N | 18.4 | 13.8–27.5 | 16.3±1.4 |
| HN13C, H15N13C | 13.9±6.2 | ||
HC3N, HC N |
>7.6 | ||
| 13CN×3.8f, C15N | 69.1 | 49.0–106.0 | |
| H13CN×3.8f, HC15N | 23.6 | 19.0–30.8 | 24.4±1.1 |
| HN13C×3.8f, 15HNC | 55.1 | 30.4–84.4 | 26.2±2.3 |
|
|
|||
| 16O/18O = 36 ± 14 [498.8]⊙ | |||
|
|
|||
| CO, C18O | 36.7 | 26.2–60.0 | 24.5±2.7 |
| SiO, Si18O | 12.1 | 9.3–16.7 | 11.5±2.3 |
| HCO+, HC18O+ | 53.1 | >25.0 | 15.3±8.1 |
| SO, S18O | >16.5 | ||
| H2CO, H2C18Od | >71.6 | ||
| 13CO, 13C18O | 69.2 | >32.0 | 40.2±19.7 |
| 13CO×3.8f, C18O | 52.1 | 35.3–76.0 | 37.4±6.2 |
| H13CO+ × 3.8f, HC18O+ | 86.5 | 39.9–534.7 | 35.4±18.8 |
|
|
|||
| 18O/17O ≳ 5 [5.4]⊙ | |||
|
|
|||
| Si18O, Si17O | >7.7 | 2.8±2.3 | |
| C18O, C17O | 5.5 | 4.9–8.3 | 4.7±4.1 |
|
|
|||
| 28Si, 29Si, 30Si:28Si/29Si = 6.7 ± 0.4 [19.7]⊙;29Si/30Si = 1.0 ± 0.1 [0.7]⊙ | |||
|
|
|||
| SiO, 29SiO | 7.3 | 5.7–9.4 | 6.6±0.5 |
| SiS, 29SiS | 7.7 | >2.3 | |
| SiO, 30SiO | 8.9 | 6.7–11.8 | 6.7±0.7 |
| 29SiO, 30SiO | 1.2 | 1.0–1.5 | 1.0±0.1 |
|
|
|||
| 32S, 33S, 34S:32S/34S = 14 ± 3 [22.5]⊙;32S/33S > 34 [126.6]⊙ | |||
|
|
|||
| CS, C33S | >34.0 | ||
| CS, C34S | 23.5 | 14.4–41.5 | 13.9±3.3 |
| SO, 34SO | 14.1 | >5.5 | |
| NS, N34S | 35.3 | >15.0 | |
| 13CS×3.8f, C34S | 19.0 | 11.8–37.2 | 14.1±7.2 |
Notes. The headlines with isotopic ratios in boldface indicate the most likely values of the ratios in CK Vul, as discussed in the text. The values given in square brackets correspond to solar system isotopic ratios from Lodders (2003).
We obtain different ratios for different transition pairs and therefore the values were not averaged.
Marty et al. (2011) measured a 14N/15N ratio of 441 for the solar wind. The value of 272.3 in Lodders (2003) corresponds to terrestrial ratio.
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