Orion variable
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Orion variables are variable stars which exhibit irregular and erruptive variations in their luminosity and are typically associated with diffuse nebulae. It is thought that these are young stars which will later become regular, non-variable stars on the zero-age main sequence. Brightness fluctuations can be as much as several magnitudes.
T Tauri stars are a special type of Orion variables.
[edit] References
Samus N.N., Durlevich O.V., et al. Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.)
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