In the context of the Hertzsprung-Russell (H-R) diagram, stars are plotted according to their absolute magnitude (intrinsic brightness) and their temperature (which correlates with color).
Blue stars, particularly those located in the upper left corner of the H-R diagram, are typically very hot and luminous. These stars often belong to the spectral types O and B, which are known for their high temperatures (greater than 10,000 K) and high luminosities.
The absolute magnitude of a blue star can vary significantly depending on its specific type and size, but many of these stars can have absolute magnitudes ranging from about -5 to -10 or even lower (brighter) for the most massive stars. For example, a typical O-type star might have an absolute magnitude around -5 to -8.
Overall, blue stars in the upper left corner of the H-R diagram are some of the most luminous and hot stars in the universe.
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