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Issue A&A
Volume 417, Number 3, April III 2004
Page(s) L39 - L43
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040078



A&A 417, L39-L43 (2004)
DOI: 10.1051/0004-6361:20040078

Letter

CO bands in V4334 Sgr (Sakurai's Object): The $\mathsf{^{12}}$C/ $\mathsf{^{13}}$C ratio

Ya. V. Pavlenko1, T. R. Geballe2, A. Evans3, B. Smalley3, S. P. S. Eyres4, V. H. Tyne3 and L. A. Yakovina1

1  Main Astronomical Observatory, Academy of Sciences of the Ukraine, Golosiiv Woods, Kyiv-127, 03680 Ukraine
2  Gemini Observatory, 670 N. A'ohoku Place, Hilo, Hi 96720, USA
3  Astrophysics Group, School of Chemistry & Physics, Keele University, Keele Staffordshire, ST5 5BG, UK
4  Centre for Astrophysics, University of Central Lancashire, Preston, Lancashire PR1 2HE, UK

(Received 19 January 2004 / Accepted 26 February 2004 )

Abstract
We present the results of our analysis of a high resolution ( $R\simeq30\,000$) 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  $\simeq$ 4  $\pm$ 1, consistent with the interpretation of V4334 Sgr as an object that has undergone a very late thermal pulse.


Key words: stars: individual: V4334 Sqr -- stars: individual: Sakurai's Object -- stars: atmospheric parameters -- stars: abundances

Offprint request: Ya. V. Pavlenko, yp@mao.kiev.ua

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© ESO 2004


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