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.]

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]

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.
References in periodicals archive ?
Michael Feast writes "Possibly Arp's most enduring work in SA was that on the colour-magnitude diagram and Cepheids in the young globular cluster NGC 1866.
The colour-magnitude diagram (CMD) of a star cluster is a variant of the familiar Herzsprung-Russell diagram (HRD) and provides information about the state of evolution of stars in the cluster in relation to the stellar main sequence.
We used some of the educational resources available on the Faulkes Telescope website to take the students through the process of making composite colour images of various types of deep sky object from separate RGB images, constructing colour-magnitude diagrams of some open clusters from images taken with B and V filters, and measuring the fading lightcurve of a supernova using images obtained over a 3 month period.