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Variable star
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=====Orion variables===== {{Main|Orion variable}} Orion variables are young, hot [[pre–main-sequence star]]s usually embedded in nebulosity. They have irregular periods with amplitudes of several magnitudes. A well-known subtype of Orion variables are the [[T Tauri star|T Tauri]] variables. Variability of [[T Tauri star]]s is due to spots on the stellar surface and gas-dust clumps, orbiting in the circumstellar disks.
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