Component A thumb|Mira in UV and visible light Mira A is currently an asymptotic giant branch (AGB) star, in the thermally pulsing AGB phase. Each pulse lasts a decade or more, and an amount of time on the order of 10,000 years passes between each pulse. With every pulse cycle Mira increases in luminosity and the pulses grow stronger. This is also causing dynamic instability in Mira, resulting in dramatic changes in luminosity and size over shorter, irregular time periods.
Component A thumb|Mira in UV and visible light Mira A is currently an asymptotic giant branch (AGB) star in the thermally pulsing AGB phase. Each pulse lasts a decade or more, and an amount of time on the order of 10000 years passes between each pulse. With every pulse cycle Mira increases in luminosity and the pulses grow stronger. This is also causing dynamic instability in Mira, resulting in dramatic changes i.n luminosity and size over shorter, irregular time periods