A new wolf-rayet star and its ring nebula: PCG11

Martin Cohen*, Quentin A. Parker, Anne J. Green

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


In a search for new Galactic planetary nebulae from our systematic scans of the Anglo-Australian Observatory/United Kingdom Schmidt Telescope (AAO/UKST) Hα Survey of the Southern Galactic Plane, we have identified a Population I Wolf-Rayet star of type WN7h associated with an unusual ring nebula that has a fractured rim. We present imagery in Ha, the 843-MHz continuum from the Molonglo Observatory Synthesis Telescope (MOST), the mid-infrared from the Midcourse Space Experiment (MSX), and confirmatory optical spectroscopy of the character of the nebula and of its central star. The inner edge of the Ha shell shows gravitational instabilities with a well-defined wavelength around its complete circumference.

Original languageEnglish
Pages (from-to)1439-1447
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 11 Jul 2005


  • Instabilities
  • ISM: bubbles
  • Stars: wolf-Rayet

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