Table 3
Isotopic ratios of C and O measured in the ISM (from CO) and in this work (from CO2).
| Ratio | ISM | Observed | Reference |
|---|---|---|---|
| 12C/13C | 67 ± 15 | 4a ± 4 | Milam et al. (2005) |
| 16O/18O | 557b ± 15 | 65 ± 92 | Wilson & Rood (1994) |
| 16O/17O | 2005b | 174 ± 247 | Wilson & Rood (1994) |
| 18O/17O | 3.2 ± 0.2 | 3 ± 4 | Penzias (1981) |
Notes. Column 3 reports the column density ratio from Table 2. Column 4 report the references for the measured ratios in the ISM. aThis ratio is likely due to line optical depth effects and not a true abundance anomaly (see text). bWe consider half of these ratios, counting one 18O/17O atom in CO2.
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