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* Hertzsprung – Russell diagram ( H-R diagram or HRD, also known as a colour-magnitude diagram or CMD ), used in understanding stellar evolution in astronomy and astrophysics
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Hertzsprung and –
* Hertzsprung – Russell diagram – Relates absolute magnitude or luminosity versus spectral color or surface temperature.
These color-magnitude plots are known as Hertzsprung – Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell.
A plot of the temperature of many stars against their luminosities, known as a Hertzsprung – Russell diagram ( H – R diagram ), allows the age and evolutionary state of a star to be determined.
A Hertzsprung – Russell Diagram can be plotted for these clusters which has absolute values known on the luminosity axis.
The PMS star follows a Hayashi track on the Hertzsprung – Russell ( H – R ) diagram.
Hertzsprung – Russell diagram identifying stellar luminosity as a function of temperature for many stars in our solar neighborhood. In astronomy, luminosity is the amount of electromagnetic energy a body radiates per unit of time.
Intrinsic variable types in the Hertzsprung – Russell diagram
Ejnar Hertzsprung (, 8 October 1873 – 21 October 1967 ) was a Danish chemist and astronomer.
In the period 1911 – 1913, together with Henry Norris Russell, he developed the Hertzsprung – Russell diagram.
The so-called " Hertzsprung – Russell Diagram " has been used ever since as a classification system to explain stellar types and evolution.
They occupy the top region of the Hertzsprung – Russell diagram.
The various distinctive types of stars are shown by the Hertzsprung – Russell diagram ( H-R diagram ), which is a plot of absolute stellar luminosity versus surface temperature.
Standard theories of stellar evolution hold that the position of a star on the Hertzsprung – Russell diagram should be determined almost entirely by the initial mass of the star and its age.
# REDIRECT Hertzsprung – Russell diagram
In the Hertzsprung – Russell diagram, the star would then appear on the stellar birthline.
In the standard Hertzsprung – Russell diagram, blue giants are found in the upper left corner, due to their high luminosity and early spectral type.
Apart from this, because of their large radii and luminosities, giant stars lie above the main sequence ( luminosity class V in the Yerkes spectral classification ) on the Hertzsprung – Russell diagram and correspond to luminosity classes II or III.
During this portion of its evolution, labeled the subgiant branch on the Hertzsprung – Russell diagram, the luminosity of the star remains approximately constant and its surface temperature decreases.
Eventually the star will start to ascend the red giant branch on the Hertzsprung – Russell diagram.
Hertzsprung and Russell
Of the red stars observed by Hertzsprung, the dwarf stars also followed the spectra-luminosity relationship discovered by Russell.
This name reflected the parallel development of this technique by both Hertzsprung and Russell earlier in the century.
* 1910 — Ejnar Hertzsprung and Henry Norris Russell study the relation between magnitudes and spectral types of stars
Hertzsprung and diagram
If not very massive, it may be found in the horizontal branch on the Hertzsprung – Russell diagram, or its position in the diagram may move in loops .< sup >, chapter 6 .</ sup > If the star is not heavier than approximately 8 solar masses, it will eventually exhaust the helium at its core and begin to fuse helium in a shell around the core.
It will then increase in luminosity again as, now an AGB star, it ascends the asymptotic giant branch of the Hertzsprung – Russell diagram.
# REDIRECT Hertzsprung – Russell diagram
# REDIRECT Hertzsprung – Russell diagram
Hertzsprung and also
The inner perimeter is also pierced by several craters, including Hertzsprung D along the eastern portion and Hertzsprung S on the western side.
Hertzsprung and CMD
The horizontal branch is so named because in low-metallicity samples like globular clusters, HB stars lie along a roughly horizontal line in a Hertzsprung – Russell diagram ( CMD ).
Hertzsprung and ),
These stars are more luminous than main sequence stars of the same surface temperature ( or colder than main sequence stars of comparable luminosity ), or above and to the right of the main sequence on the Hertzsprung – Russell diagram.
Hertzsprung and used
However, Ejnar Hertzsprung realized the value of her classifications and used them in his system of identifying giant and dwarf stars.
Hertzsprung and stellar
These are stars that have an unusually low absolute magnitude for their spectral class, lying well below the main sequence on the Hertzsprung – Russell diagram of stellar temperature vs. luminosity.
The outer atmosphere of the born-again star develops a stellar wind and the star once more follows an evolutionary track across the Hertzsprung – Russell diagram.
Hertzsprung and evolution
Overall luminosity changes little during the subgiant stage, as shown by a more or less horizontal evolution off the immediate main sequence ; this feature is prominent in Hertzsprung – Russell diagrams of globular clusters, as the lateral extension after the turnoff point but before the " ascent " to red giant status.
Hertzsprung – Russell diagram showing the evolution of stars of different masses.
– and Russell
* Weigley, Russell F. A Great Civil War: A Military and Political History, 1861 – 1865.
* Bertrand Russell, ( 1779 – 2009 ) Why I Am Not a Christian, ISBN 0-671-20323-1
* 1916 – Russell Garcia, American composer ( d. 2011 )
* 1985 – JaMarcus Russell, American football player
* 1981 – Russell Harvard, American actor
* 1925 – Russell Baker, American writer
* 1963 – Jack Russell, England cricketer and coach
* 1980 – Russell Kane English comedian, actor, and writer
* 1932 – Mark Russell, American comedian, singer, and pianist
* 1947 – Willy Russell, English playwright an composer
* 1942 – Leon Russell, American pianist and guitarist
* 1971 – Russell Payne, English author
* 1941 – Bobby Russell, American singer-songwriter ( d. 1992 )
* 1964 – Russell Crowe, New Zealand actor
* John Russell, 1st Earl Russell 1865 – 1868
Bertrand Russell, the first to discuss the paradox in print, attributed it to G. G. Berry ( 1867 – 1928 ), a junior librarian at Oxford's Bodleian library, who had suggested the more limited paradox arising from the expression " the first undefinable ordinal ".
* 2005 – Darrell Russell, American football player ( b. 1976 )
* 1787 – Mary Russell Mitford, English writer ( d. 1855 )
* 1960 – Jack Russell, American singer ( Great White )
* 1910 – Russell Lynes, American art historian, photographer, author and managing editor of Harper's Magazine ( d. 1991 )
* 1911 – Anna Russell, English-born Canadian singer and comedian ( d. 2006 )
Fellow critic James Russell Lowell called him " the most discriminating, philosophical, and fearless critic upon imaginative works who has written in America ", suggesting – rhetorically – that he occasionally used prussic acid instead of ink.
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