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Irregular variable starIt is a kind of variable star. It does not show regular periodicity in the change of luminosity. There are two main types of irregular variable stars: cataclysmic and pulsating.
It can be divided into IA (spectral classification from O to A) and IB (spectral classification from F to M).
Category II
Known as IN (Irregular Nebula) variable stars, they all appear infixed starIn the formation area, the luminosity may change by several magnitudes, and can change rapidly, producing a magnitude change within 1 to 10 days.The same can be divided into INA and INB according to the spectrum, but there are other types of Taurus T variable stars belonging to INT,OrionYY variable stars are classified as INT (YY).
Category III
They are IS stars. Their luminosity can change by 0.5 to 1 in a few days or hours. Similarly, they can be divided into ISA and ISB according to the spectrum.
Pulsating type
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Pulsating typeIrregular variable stars are giant or sub giant stars, and their spectra are late type (K, M, C or S). If they are giant stars, they are classified as L-LB, and sub giant stars are LC.I don't know how many irregular variable stars areSemiregular variable star, which needs further research.
