EDP Sciences
Free access
Volume 390, Number 2, August I 2002
Page(s) 621 - 626
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020732

A&A 390, 621-626 (2002)
DOI: 10.1051/0004-6361:20020732

Models of infrared spectra of Sakurai's Object (V4334 Sgr) in 1997

Y. V. Pavlenko1, 2 and T. R. Geballe3

1  Main Astronomical Observatory of Academy of Sciences of Ukraine, Golosiiv woods, Kyiv-127, 03680 Ukraine
2  Isaac Newton Institute of Chile, Kiev Branch
3  Gemini Observatory, 670 N. A'ohoku Place, Hilo, HI 96720 USA
    e-mail: tgeballe@gemini.edu

(Received 5 March 2002 / Accepted 17 May 2002 )

Theoretical spectral energy distributions computed for a grid of hydrogen-deficient and carbon-rich model atmospheres have been compared with the observed infrared (1-2.5  $\mu$m) spectra of V4334 Sgr (Sakurai's Object) on 1997 April 21 and July 13. The comparison yields an effective temperature of $T_{\rm eff}$ = 5500 $\pm$ 200 K for the April date and $T_{\rm eff}$ = 5250 $\pm$ 200 K for July. The observed spectra are well fitted by Asplund et al. (1999) abundances, except that the carbon abundance is higher by 0.3 dex. Hot dust produces significant excess continuum at the long wavelength ends of the 1997 spectra.

Key words: stars: individual: V4334 Sgr (Sakurai's Object) -- stars: AGB and post-AGB -- stars: atmospheres -- stars: fundamental parameters

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

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