A new Wolf–Rayet star and its ring nebula: PCG 11 |
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| Authors: | Martin Cohen Quentin A. Parker Anne J. Green |
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| Affiliation: | Radio Astronomy Laboratory, University of California, Berkeley, CA 94720, USA;Department of Physics, Macquarie University, Sydney, NSW 2109, Australia;Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia;School of Physics, University of Sydney, NSW 2006, Australia |
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| Abstract: | 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 Hα, 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 Hα shell shows gravitational instabilities with a well-defined wavelength around its complete circumference. |
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| Keywords: | instabilities stars: Wolf–Rayet ISM: bubbles |
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