We present the results of our analysis of a high resolution () infrared spectrum of V4334 Sgr (Sakurai's Object) around the first overtone CO bands, obtained in 1998 July. The 12CO and 13CO bands are well-resolved, and we compute synthetic hydrogen-deficient model atmosphere spectra to determine the 12C/13C ratio. We find 12C/13C 4 ± 1, consistent with the interpretation of V4334 Sgr as an object that has undergone a very late thermal pulse.
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