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An '''irregular variable''' is a type of [[variable star]] in which variations in brightness show no regular [[Frequency|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 splittey into subgroups IA (spectral types O to A) and IB (spectral types F through M). ▼
▲* Group I variables are splittey into subgroups IA (spectral types O to A) and IB (spectral types F through M).
* [[Orion variables]], GCVS type IN (irregular and nebulous), 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(YY) 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.
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== References ==
{{Reflist}}
[[Category:Irregular variables| ]]▼
{{var-star-stub}}
▲[[Category:Irregular variables| ]]
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