Blue dwarf

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Blue dwarfs are main sequence stars of spectral type O.

A typical type O dwarf has a mass of 50 Suns and is tens of thousands of times more luminous than the Sun. Hottest of all the main sequence stars yet known are of type O3. Because very massive stars have short lifespans, blue dwarfs are extremely rare: only about one star in ten million is a blue dwarf. However, because they are so luminous (and thus more easily seen), a disproportionate amount of O stars have been charted in comparison to the frequency of other star classes.

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