These constant radius lines go from the upper left to the lower right (negative slope) of the diagram. Figure 12.19 shows these constant radius lines on the H-R diagram. Stars fall into three general categories. These categories are main sequence stars, red giants, and white dwarfs.. These values are for a star at the position of the red X cursor shown in the H-R diagram. The Size Comparison panel above shows the relative size and color of such a star compared to our Sun.
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H-R Diagram Explorer Three modes: place any star on the Hertzsprung-Russell diagram by entering its temperature, radius, and mass. Compare up to 8 stars side by side or browse the complete spectral classification atlas from O-type blue giants to M-type red dwarfs. 23 real reference stars are plotted for context.. Features of the H-R Diagram Following Hertzsprung and Russell, let us plot the temperature (or spectral class) of a selected group of nearby stars against their luminosity and see what we find (Figure 18.14). Such a plot is frequently called the Hertzsprung-Russell diagram, abbreviated H-R diagram.