Hertzsprung-Russell diagram

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Hertz·sprung-Rus·sell diagram

 (hĕrts′sprŭng-rŭs′əl)
n.
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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Hertzsprung-Russell diagram

(ˈhɜːtssprʌŋˈrʌsəl)
n
(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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Hertz·sprung-Rus·sell diagram

(hĕrts′spro͝ong-rŭs′əl)
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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Before her eighteenthAEs birthday she produced a 55-page paper entitled oAnalysis of Color Magnitude Diagrams of Selected Start Clusters from the Viewpoint of Stellar Evolution.o She now travels the globe every year searching for the oldest stars utilizing the worldAEs largest telescopes.