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In stellar evolution, FU Orionis stars are pre-main sequence stars which display an extreme change in magnitude and spectral type. One example is the star V1057 Cyg, which became 6 magnitudes brighter and went from spectral type dKe to F supergiant.
The current model associates the FU Orionis flare with abrupt disk accretion onto a young, low mass T Tauri star.
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