Table 8
Line intensity ratios IMB(12CO)/IMB(13CO) for the sample stars give first order estimates of their isotope abundance ratio 12C/13C.
| IMB(12CO)/IMB(13CO) | M09 | |||||
| Target | 2−1 | 3−2 | 4−3 | 6−5 | 12C/13C | 12C/13C |
|
|
||||||
| O-rich | ||||||
| RX Boo | 12.0 | 10.5 | – | – | 9.8 | – |
| EP Aqr | 9.5 | 6.2 | 12.3 | – | 8.1 | – |
| T Cet | 11.5 | 14.4 | – | – | 11.2 | – |
| o Cet | 12.2 | 8.0 | - | 3.3 | 6.8 | – |
| IK Tau | 8.7 | 6.8 | – | – | 6.7 | 10 |
| TX Cam | 17.1 | 13.3 | – | – | 13.2 | 31 |
| NV Aur | 5.4 | – | – | – | 4.7 | – |
| R Hya | 6.1 | – | – | – | 5.3 | – |
| R Cas | 20.8 | 12.4 | – | – | 14.4 | – |
| WX Psc | 6.2 | 5.5 | - | – | 5.1 | – |
| AFGL 5379 | 8.3 | – | – | – | 7.2 | – |
| OH 44.8-2.3 | 3.8 | 7.6 | – | – | 4.9 | – |
| NML Cyg | 10.0 | – | – | – | 8.7 | 13 |
| α Ori | 6.5 | – | - | – | 5.7 | 8 |
| VY CMa | 19.7 | 14.3 | – | – | 14.8 | 25, 33, 46 |
| VX Sgr | – | 22.0 | - | – | 19.2 | – |
| IRC +10420 | 9.0 | 9.7 | – | – | 8.1 | 14 |
| AFGL 2343 | – | 3.8 | – | – | 3.3 | – |
| S-type | ||||||
| π1 Gru | – | 35.3 | – | – | 30.7 | – |
| W Aql | 16.1 | 12.8 | – | – | 12.6 | – |
| χ Cyg | – | 16.2 | – | – | 14.1 | 33 |
| C-rich | ||||||
| V Hya | – | 30.7 | – | – | 26.7 | 71, 72 |
| R Scl | – | 10.6 | – | – | 9.2 | – |
| II Lup | – | 4.6 | – | – | 4.0 | – |
| IRC +20370 | – | 8.1 | – | – | 7.1 | – |
| V Cyg | 13.8 | – | – | – | 12.0 | – |
| LL Peg | – | 4.2 | – | – | 3.6 | – |
Notes. An absolute flux error of 20% for transitions J = 2−1, 3−2, and 4−3 gives an error of 28% on the respective line intensity ratios. For J = 6−5, the absolute flux error is of the order of 30%, so the error on the line intensity ratio is about 42%. The 12C/13C-value listed in the second to last column is the mean line intensity ratio, corrected with a factor 0.87 for the difference in line strengths (Eq. (15)). The last column (M09) lists the values derived by Milam et al. (2009) from CO data.
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