A Class A star is the third brightest type of main sequence star. They are typically coloured white. They make up roughly 0.7% of main sequence stars. A typical Class A star has a mass of 2 (1.6 to 2.9) solar masses, a radius of 1.7 (1.5 to 2.4) solar radii, a luminosity of 20 (6.5 to 54) solar luminosities, a surface temperature of 8500 K (7200 K to 9500 K), and a lifespan of 1 billion years.
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