Far Ultraviolet Spectroscopic Explorer spectroscopy of the O VI resonance doublet in sand 2 (WO)

Paul A. Crowther*, A. W. Fullerton, D. J. Hillier, K. Brownsberger, L. Dessart, A. J. Willis, O. De Marco, M. J. Barlow, J. B. Hutchings, D. L. Massa, D. C. Morton, G. Sonneborn

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)L51–L55
Number of pages5
JournalAstrophysical Journal
Volume538
Issue number1
Publication statusPublished - 20 Jul 2000
Externally publishedYes

Keywords

  • Stars: evolution
  • Stars: individual (Sand 2)
  • Stars: Wolf-Rayet

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    Crowther, P. A., Fullerton, A. W., Hillier, D. J., Brownsberger, K., Dessart, L., Willis, A. J., ... Sonneborn, G. (2000). Far Ultraviolet Spectroscopic Explorer spectroscopy of the O VI resonance doublet in sand 2 (WO). Astrophysical Journal, 538(1), L51–L55.