CO bands in V4334 Sgr (Sakurai's Object): the 12C/13C ratio
Ya. V. Pavlenko, T. R. Geballe, A. Evans, B. Smalley, S. P. S. Eyres, V. H. Tyne, L. A. Yakovina
Abstract
We present the results of our analysis of a high resolution (R ~ 30000) 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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