Interesting Hertzsprung–Russell diagrams

Two very interesting images about the H-R diagram!

The Hertzsprung–Russell diagram is a scatter graph of stars showing the relationship between the stars’ absolute magnitudes or luminosity versus their spectral types or classifications and effective temperatures.

This diagram below is a plot of 22000 stars from the Hipparcos Catalogue together with 1000 low-luminosity stars (red and white dwarfs) from the Gliese Catalogue of Nearby Stars.

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hertzsprung-russellimage source

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