Usually taken to be another name for a Mira star. In the past, the term was applied more generally to mean any red giant or supergiant pulsating variable with a period of 20 to 1,000 days, including, in addition to Mira variables, semi-regular variables and slow irregular variables. Long-period blue variables are pulsating B stars with periods longer than one day and amplitudes generally less than 0.05 magnitude but occasionally up to 0.1 magnitude.
Related entry• variable stars
Related category• TYPES OF STAR
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