Hertzsprung-Russell diagram
- Hertzsprung-Russell diagram
-
/hairt"sproong rus"euhl/,
Astron.
the graph showing the absolute magnitude plotted against the surface temperature for a group of stars. Also called
H-R diagram.
[after Danish astronomer Ejnar Hertzsprung (1873-1967) and H. N. RUSSELL, who compiled the data on which it is based]
* * *
Graph in which the absolute
magnitudes of
stars are plotted against their colours (a measure of their temperatures).
Of great importance to theories of stellar evolution, it evolved from charts begun independently in 1911 by the Danish astronomer Ejnar Hertzsprung (1873–1967) and the U.S. astronomer Henry Norris Russell (1877–1957). On the diagram, stars are ranked from bottom to top in order of increasing brightness and from right to left by increasing temperature. Stars tend to cluster in certain parts of the diagram, especially along a diagonal line, called the main sequence, which is the locus of hydrogen-burning stars of different masses.
* * *
Universalium.
2010.
Look at other dictionaries:
Hertzsprung–Russell diagram — Hertzsprung–Russell diagram[1] with 22,000 stars plotted from the Hipparcos catalog and 1,000 from the Gliese catalog of nearby stars. Stars tend to fall only into certain regions of the diagram. The most predominant is the diagonal, going from… … Wikipedia
Hertzsprung-Russell diagram — The Hertzsprung Russell diagram (usually referred to by the abbreviation H R diagram or HRD, also known as a colour magnitude diagram, or CMD) shows the relationship between absolute magnitude, luminosity, classification, and effective… … Wikipedia
hertzsprung-russell diagram — ˈhertˌspru̇ŋˈrəsəl noun Usage: usually capitalized H&R Etymology: after Ejnar Hertzsprung died 1967 Dan. astronomer and Henry Norris Russell died 1957 American astrophysicist : spectrum luminosity diagram * * * /hairt sproong rus euhl/, Astron.… … Useful english dictionary
Hertzsprung–Russell diagram — ▪ astronomy in astronomy, graph in which the absolute magnitudes (intrinsic brightness) of stars are plotted against their spectral types. Of great importance to theories of stellar evolution, it evolved from charts begun in 1911 by the Danish… … Universalium
Hertzsprung-Russell diagram — /ˌhɜtsprʌŋ ˌrʌsəl ˈdaɪəgræm/ (say .hertsprung .rusuhl duyuhgram) noun a graph in which the absolute luminosity of a star is plotted against its spectral type (an indication of its temperature). The theory of stellar evolution has been derived… …
Hertzsprung-Russell diagram — noun a plot of the absolute magnitude of stars versus their colour (or surface temperature); shows the main sequence of stars plus the white dwarfs and red giants … Wiktionary
Hertzsprung - Russell diagram — … Useful english dictionary
Hertzsprung–Russell diagram — … Useful english dictionary
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