X-ray emission from the wolf-rayet bubble s 308

J. A. Toalá, M. A. Guerrero, Y. H. Chu, R. A. Gruendl, S. J. Arthur, R. C. Smith, S. L. Snowden

Research output: Contribution to journalArticlepeer-review


The Wolf-Rayet (WR) bubble S308 around the WR star HD50896 is one of the only two WR bubbles known to possess X-ray emission. We present XMM-Newton observations of three fields of this WR bubble that, in conjunction with an existing observation of its northwest quadrant, map most of the nebula. The X-ray emission from S308 displays a limb-brightened morphology, with a central cavity 22′ in size and a shell thickness of 8′. This X-ray shell is confined by the optical shell of ionized material. The spectrum is dominated by the He-like triplets of N VI at 0.43keV and O VII at 0.57keV, and declines toward high energies, with a faint tail up to 1keV. This spectrum can be described by a two-temperature optically thin plasma emission model (T 1 1.1 × 106K, T 2 13 × 10 6K), with a total X-ray luminosity 2 × 1033ergs -1 at the assumed distance of 1.5kpc.

Original languageEnglish (US)
Article number77
JournalAstrophysical Journal
Issue number1
StatePublished - Aug 10 2012


  • ISM: bubbles
  • ISM: individual objects (S 308)
  • X-rays: individual (S 308)
  • outflows
  • stars: Wolf-Rayet
  • stars: individual (HD 50896)
  • stars: winds

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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