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irregular variable comparison table
Subject has spectral type has acronym has recovery time has outburst start time is a kind of has peak brightness has emission line has synonym has definition
cataclysmic variable CV  irregular variable  explosive variableA collective name for stars in which the brightness increases suddenly because of an explosive event. The class comprises supernovae, novae, recurrent novae, dwarf novae and flare stars.
T Tauri starcooler than G2   emission line star  nebular variableAlso called T Tauri variable, a type of variable star of spectral classification F, G or K (giants above the main sequence on the Hertzsprung-Russell diagram) that loses an appreciable proportion of its mass in its (irregular) more luminous periods, and is thus surrounded by volumes of gas and dust.

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