The characteristic describes the stars indicated by the arrow in the image is hot.
What does the HR diagram describe?
In astronomy, the Hertzsprung-Russell diagram is a distribution graph that shows the relationship between absolute magnitude or luminosity versus spectral type or stellar classification and effective temperature.
Absolute magnitude, which measures the luminosity of an object (or reflected light for non-luminous objects like asteroids), is the apparent magnitude of the object seen from a certain distance.
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