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Hertzsprung and
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
* 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
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 absolute
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.

Hertzsprung and luminosity
The effective temperature and the bolometric luminosity are the two fundamental physical parameters needed to place a star on the Hertzsprung Russell diagram.
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.
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 .
In Potsdam in 1906, the Danish astronomer Ejnar Hertzsprung noticed that the reddest stars — classified as K and M in the Harvard scheme — could be divided into two distinct groups.
The first color-magnitude diagrams of open clusters were published by Ejnar Hertzsprung in 1911, giving the plot for the Pleiades and Hyades star clusters.
He befriended fellow students Bart Bok and Pieter Oosterhoff and was taught by Ejnar Hertzsprung, Antonie Pannekoek, Willem de Sitter, Jan Woltjer, Jan Oort and the physicist Paul Ehrenfest.
Kuiper finished his doctoral thesis on binary stars with Hertzsprung in 1933, after which he immediately traveled to California to become a fellow under Robert Grant Aitken at the Lick Observatory.
Hertzsprung was born in Copenhagen.
From 1919 to 1946 Hertzsprung worked at Leiden Observatory in The Netherlands, from 1937 as director.
Hertzsprung died in Roskilde in 1967.
In 1913, Ejnar Hertzsprung did some work on Cepheids, which needed some revision.
Using this period-luminosity relation, in 1913 the distance to the SMC was first estimated by Ejnar Hertzsprung.

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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