Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Ejnar Hertzsprung, (1873–1967), Danish astronomer, and Henry Norris Russell.]
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