We present Far Ultraviolet Spectroscopic Explorer spectroscopy of Sand 2, an LMC WO-type Wolf-Rayet star, revealing the O VI resonance P Cygni doublet at 1032-1038 Å. These data are combined with Hubble Space Telescope Faint Object Spectrograph ultraviolet and Mount Stromlo 2.3 m optical spectroscopy and analyzed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T* ∼ 150,000 K, v∞ = 4100 km s-1, log (L/L⊙) = 5.3, and M = 1 × 10-5 M⊙ yr-1, if we adopt a volume filling factor of 10%. Elemental abundances of C/He ∼ 0.7 ± 0.2 and O/He ∼ 0.15+0.10 -0.05 by number qualitatively support previous recombination line studies. We confirm that 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 × 104 yr.
|Number of pages||5|
|Publication status||Published - 20 Jul 2000|
- Stars: evolution
- Stars: individual (Sand 2)
- Stars: Wolf-Rayet