At the lower left of the Hertzprung-Russell diagram we find

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The lower left corner of the Hertzsprung-Russell (HR) diagram corresponds to relatively low-temperature, low-luminosity stars, which have exhausted their nuclear fuel and have contracted to the size of the Earth or smaller. These objects are known as white dwarfs, which are the endpoint of stellar evolution for stars with initial masses up to about 8 times that of the Sun. Supergiant stars are located at the upper right of the HR diagram, red giant stars are located above and to the right of the main sequence, and main sequence stars are located in the middle of the HR diagram, with their position determined by their mass and age.

At the Lower Left of the Hertzprung-Russell Diagram We Find