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Variable star
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====Wolf–Rayet variables==== {{Main|Wolf–Rayet star}} Classic population I Wolf–Rayet stars are massive hot stars that sometimes show variability, probably due to several different causes including binary interactions and rotating gas clumps around the star. They exhibit broad emission line spectra with [[helium]], [[nitrogen]], [[carbon]] and [[oxygen]] lines. Variations in some stars appear to be stochastic while others show multiple periods.
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