What extreme surface temperature threshold can certain Wolf-Rayet stars possibly exceed near the end of their lives?
Answer
200,000 K
Wolf-Rayet stars represent a highly evolved and rare stage in the life cycle of massive stars, having already shed their outer hydrogen layers to expose super-hot inner material, often consisting of helium and heavier elements. These conditions result in surface temperatures that are among the highest observed in the cosmos, with some sources citing figures that possibly exceed $200,000$ Kelvin. This surface temperature is dramatically higher than the hottest stable main-sequence stars and vastly greater than the Sun's surface temperature of approximately 5,778 K.
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WR102. A star that is 200,000 degrees hotter than the Sun. - YouTube
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