An extremely hot, massive star that has shed its outer hydrogen layers, revealing its helium core and producing strong stellar winds with velocities up to 3,000 km/s. These rare stars represent a brief evolutionary phase before core collapse and supernova explosion.
Named after French astronomers Charles Wolf and Georges Rayet who discovered the first examples in 1867 at the Paris Observatory. They noticed these stars had unusual emission lines rather than the typical absorption lines, indicating extremely hot, fast-moving gas around the star.
Wolf-Rayet stars are cosmic strip-teasers, literally blowing off their outer layers at incredible speeds! These stellar powerhouses are so hot (50,000-200,000 K) that they ionize gas hundreds of light-years away, creating spectacular bubble nebulae. They're the immediate precursors to some of the most energetic supernovae and gamma-ray bursts, making them cosmic time bombs ticking away in our galaxy.
Named for astronomers Charles Wolf and Georges Rayet (both male, 1867). The discovery and naming convention reflects 19th-century male-dominated observatories. Female observers like Williamina Fleming catalogued thousands of spectral types simultaneously with minimal recognition.
Use 'Wolf-Rayet star' or 'W-R star' as-is; it's the standard term. When citing this discovery, mention Williamina Fleming's contemporary work on stellar spectroscopy at Harvard Observatory.
Williamina Fleming, a Scottish immigrant hired as a 'computer' at Harvard Observatory, discovered 10 novae and catalogued over 10,000 stars while earning a fraction of male colleagues' wages. Her spectroscopic work directly enabled the classification of Wolf-Rayet stars.
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