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slow irregular variable
A slow irregular variable (ascribed the GCVS types L, LB and LC) is a variable star that exhibit no or very poorly defined periodicity in their slowly changing light emissions. These stars have often been little-studied, and once more is learnt about them, they are reclassified into other categories such as semiregular variables.
Most of irregular variables are cool stars of late spectral types K and M, S stars or carbon stars. They are divided into LB:s, which are generally giants, and LC:s—supergiants exhibiting a light variation interval of about 1 magnitude.〔(GCVS Variability Types )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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