Semiregular variable star
0thumb|right|upright=1.5|Light curve of semiregular variable star Betelgeuse In astronomy, a semiregular variable star, a type of variable star, is a giant or supergiant of intermediate and late (cooler) spectral type showing considerable periodicity in its light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to more than 2000 days, while the shapes of the light curves may be rather different and variable with each cycle. The amplitudes may be from several hundredths to several magnitudes (usually 1-2 magnitudes in the V filter).
Source: https://en.wikipedia.org/wiki/Semiregular_variable_star
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