Far Ultraviolet Spectroscopic Explorer spectroscopy of the O vi resonance doublet in Sand 2 (WO)

We present Fnr Ultraviolet Spectroscopic Explorer spectroscopy of Sand 2, a n LMC WO-type Wolf-Rayet star, revealing the O VI resonance P Cygni doublet at 1032-1038 Angstrom. These data are combined with Hubble Space Telescopi c Faint Object Spectrograph ultraviolet and Mount Stromlo 2.3 m optical spe ctroscopy and analyzed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T* similar to 150,000 K, v(i nfinity) = 4100 km s(-1), log (L/L-.) = 5.3, and (M)over dot = 1 x 10(-5) M . yr(-1), if we adopt a volume filling factor of 10%. Elemental abundances of C/He similar to 0.7 + 0.2 and O/He similar to 0.15(-0.05)(+0.10) by numb er qualitatively support previous recombination line studies. We confirm th at Sand 2 is more chemically enriched in carbon than LMC WC stars and that it is expected to undergo a supernova explosion within the next 5 x 10(4) y r.