Hertzsprung-Russell diagram


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Related to Hertzsprung-Russell diagram: Life cycle of a star

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 ?
The name derives from their position on the famous Hertzsprung-Russell diagram, which classifies stars according to their brightness and temperature.
* Supergiants are stars with luminosities between those of the giants and hypergiants on the Hertzsprung-Russell diagram. They are divided into red supergiants, orange supergiants, and blue supergiants according to their surface temperatures.
The end product looked at the distances of each star and the spectral classes of the stars shown by colour through the Hertzsprung-Russell diagram. Hertzsprung-Russell diagrams classify stars according to age and mass, by plotting star luminosity and temperature.
It still is on the hydrogen-burning main sequence of the Hertzsprung-Russell diagram of stellar evolution.
In science, what is found on a Hertzsprung-Russell diagram? 7.
After a red giant has depleted all the helium in its core, it goes through various death throes, then sinks to the lower left in the Hertzsprung-Russell diagram, becoming a lifeless "white dwarf." White dwarfs glow with remnant heat left over from their glory days, but they just get ever dimmer as they age.
Russell constructed the Hertzsprung-Russell diagram.
The contraction towards dense cores, which must get rid of their increasing thermal energy through molecular line radiation, is treated, discussing also how development appears on a Hertzsprung-Russell diagram (in the case of low-mass stars)-e.g., the Hayashi and Henyey tracks which are followed before long-term evolution commences along the Main Sequence.
Leitherer (Space Telescope Science Institute, US), Bennett (Saint Mary's U., Canada), Morris (NASA Herschel Science Center, US), and van Loon (Keele U., UK) present the proceedings of a November 2008 workshop bringing together researchers studying the morphologically separated, yet evolutionarily connected, stars in the upper blue and red sections of the Hertzsprung-Russell diagram, which have typically been studied separately in spite of their connections.
47 Types of what are represented on a Hertzsprung-Russell diagram?