Abstract
We present the results of a systematic search for H II ring nebulae surrounding Wolf-Rayet (WR) stars in M33. Eleven objects are found to be good candidates, while eight others are classified as possible WR ring nebulae. The WR rings in M33 are larger on average than their galactic counterparts, but the H α luminosity of most of them is comparable to the bright Galactic wind-blown bubbles. The rings are associated with WC as well as with WN stars. No He III region has been detected.
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