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Fig. 2

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Observed first overtone CO bandheads of B163 (black line) shown together with models varying in 12CO/13CO ratio – a decreasing ratio signifying more 13CO. The red line indicates the best fit model for this target, with no 13CO included, the green lines indicate models differing only in the amount of 13CO. Including 13CO with the ISM value (89) clearly improves the fit with respect to fitting 12CO only. Decreasing the ratio leads to progressively worse fits, indicating that 13CO is likely not enhanced in the circumstellar environment of this object.

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