Irregular variable irregular variable a type of variable star in which variations in brightness show no regular periodicity . There are two main sub-types of irregular variable: eruptive and pulsating.Eruptive irregular variables are divided into three categories: Group I variables are split into subgroups IA and IB . Orion variables , GCVS type IN , indigenous to star-forming regions , may vary by several magnitudes with rapid changes of up to 1 magnitude in 1 to 10 days, are similarly divided by spectral type into subgroups INA and INB, but with the addition of another subgroup, INT , for T Tauri stars , or INT for YY Orionis stars. The third category of eruptive irregulars are the IS stars, which show rapid variations of 0.5 to 1 magnitude in a few hours or days; again, these come in subgroups ISA and ISB . Pulsating irregular giants or supergiants, called slow irregular variables, are all of late spectral types , and classed as type L-LB for giants and LC for supergiants. How many of these are actually semi-regular variables that simply need more study, remains unclear.
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