Wolf-Rayet stars and giant H II regions in M33 - Casual associations or meaningful relationships

Mathematics – Logic

Scientific paper

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H Ii Regions, Spiral Galaxies, Stellar Evolution, Stellar Spectra, Wolf-Rayet Stars, Magellanic Clouds, Spectrum Analysis, Star Distribution, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

The discovery is reported of 14 new Wolf-Rayet stars in the Local Group galaxy M33, of which six are surrounded by small H II regions and have spectra and M(v) similar to field W-R stars in the Galaxy. In addition, eight of the stars are found to be among the brightest in the giant H II regions NGC 588, 592, 595 and 604, and similar to the superluminous W-R's found in 30 Dor in the Large Magellanic Cloud and HD 97950 in NGC 3603. It is concluded after a discussion of statistics pertaining to the W-R types known in M33 that selection effects still dominate the discovery process, and it is suggested that the morphological similarities among superluminous W-R star spectra and the dynamics of giant H II regions imply a shared evolutionary pattern where the nebulae may be dominated by the effects of a few massive, unstable objects with W-R spectra.

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