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The surface temperature of a star determines the color of light it emits. Blue stars are hotter than yellow stars, which are hotter than red stars.
Our Sun is a G-class star.
The Sun is found on the main sequence with a luminosity of 1 and a temperature of around 5,400 Kelvin. Astronomers generally use the HR diagram to either summarise the evolution of stars, or to investigate the properties of a collection of stars.
Hertzsprung-Russell diagram, also called H-R diagram, in astronomy, graph in which the absolute magnitudes (intrinsic brightness) of stars are plotted against their spectral types (temperatures).
High mass stars are hotter, and are white or blue white. Extremely high mass stars may even shine a pale violet, which is more "blue" than blue white. High mass stars are also much brighter than low mass stars, because they produce much more energy. Astronomers classify stars by the light they emit (or give off).
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The Hertzsprung-Russell diagram shows the relationship between a star's temperature and its luminosity. It is also often called the H-R diagram or colour-magnitude diagram. The chart was created by Ejnar Hertzsprung and Henry Norris Russell in about 1910.
Type O stars have the highest surface temperatures and can be as hot as 30,000 Kelvins.
Two factors determine the brightness of a star: luminosity - how much energy it puts out in a given time. distance - how far it is from us.
This is because of scintillation ("Twinkling") as the light passes through the atmosphere of the Earth. As the air moves in and out, the starlight is refracted, often different colors in different directions. Because of this "chromatic abberation," stars can appear to change colors when they are twinkling strongly.
The Hertzsprung\u2013Russell diagram, abbreviated as H\u2013R diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

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