Hertzsprung-Russell diagram(redirected from Hertzsprung-Russell classifications)
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A graph of the absolute magnitudes or luminosities of stars plotted against their surface temperatures or colors, used to classify stars by their evolutionary stages.
[After Ejnar Hertzsprung (1873-1967), Danish astronomer, and Henry Norris Russell.]
(Astronomy) a graph in which the spectral types of stars are plotted against their absolute magnitudes. Stars fall into different groupings in different parts of the graph. See also main sequence
[C20: named after Ejnar Hertzsprung and Henry Norris Russell]
A graph of the natural brightness of stars plotted against their surface temperature or color. It is used in the study of the life cycles of stars.