[DOC] [TLE] HertzsprungRussell diagram - Wikipedia [PAR] The HertzsprungRussell diagram, abbreviated HR diagram or HRD, is a 
scatter graph of stars showing the relationship between the stars' absolute 
magnitudes or luminosities versus their spectral classifications or effective 
temperatures. More simply, it plots each star on a graph measuring the star's 
brightness ... The diagram was created circa 1910 by Ejnar Hertzsprung and 
Henry Norris... [DOC] [TLE] Hertzsprung Russell Diagram - Teach Astronomy [PAR] Hertzsprung-Russell diagram showing color and size of stars. ... that exist, their 
first step was to devise a sensible way to arrange and study the data to find ... 
astronomer Ejnar Hertzsprung and the American astronomer Henry Norris 
Russell ... The Sun is near the middle of the diagram (one solar luminosity, 
spectral type G). [DOC] [TLE] The Hertzsprung-Russell Diagram - UNL Astronomy [PAR] That was not the case however, for the Hertzsprung-Russell diagram. ... 
astronomers, Ejnar Hertzsprung of Denmark and Henry Norris Russell of America
. ... The majority of these stars when plotted on an H-R diagram go down from left 
to right in a ... where L is the luminosity, R is the stellar radius, and T is the 
temperature... [DOC] [TLE] Hertzsprung-Russell diagram - Universe Today [PAR] Apr 26, 2016 ... In order to properly organize all of the stars out there, astronomers have 
developed an organizationa. ... by astronomers Ejnar Hertzsprung and Henry 
Norris Russell back in 1910 ... of the star on one axis and the luminosity of the 
star on the other. ... These are the red giant stars nearing the end of their lives. [DOC] [TLE] PPT - Uplift Education [PAR] In astronomy, we cannot perform experiments with our objects (stars, galaxies, 
). ... These stars have very different surface temperatures, as indicated by their 
color. ..... In the early 1900s, two astronomers, Ejnar Hertzsprung in Denmark and 
Henry Norris Russell in ... diagram as its temperature and luminosity changes. [DOC] [TLE] Chandra :: Educational Materials :: The Hertzsprung-Russell Diagram [PAR] Mar 9, 2015 ... In the early 1900's Ejnar Hertzsprung and Henry Norris Russell developed the 
Hertzsprung - Russell diagram (H-R diagram)  an important astronomical tool 
that ... a second type of classification system for stars was devised using 
luminosity. ... Many of these variables are either stages of stellar evolution,... [DOC] [TLE] The Hertzsprung-Russell Diagram [PAR] Ejnar Hertzsprung - many of the famous astronomers of the past started as ... 
Henry Russell found that red stars fell into two main groups - giants and ... As a 
result, a diagram mapping a star's brightness against its temperature was 
devised. .... Hertzsprung-Russell ordered their chart by assigning a letter 
representing a star's... [DOC] [TLE] Chapter 13: Stellar Evolution, Main Sequence [PAR] One Solar Luminosity is the radiation of the sun, which rounds out to 3.846*10^
26 Watts. ... As on the Hertzsprung-Russell Diagram, stars can be divided into 
different ... (make chart showing the fusion of protons and the types of radiation ... 
is an American astronomer well-known for his work with Ejnar Hertzsprung that 
led to... [DOC] [TLE] Atomic Spectra - Department of Physics and Astronomy [PAR] stars, astronomers devised ways to arrange and study the information they 
collected about the stars. Ejnar Hertzsprung (Danish) and Henry M. Russell (
American) ... simplest form, the H-R diagram is a plot of the absolute magnitudes 
(or luminosity) ... of the spectra, but it was not until much later that the significance 
of these. [DOC] [TLE] The Nature of Stars - Department of Physics and Astronomy [PAR] Oct 26, 1998 ... Correlating Spectral Class and Luminosity in a Diagram; 13.4.2. ... Red Giants, 
and White Dwarfs; Biography - Henry Norris Russell (1877-1957); 13.4.3. .... 
These are stars whose apparent magnitudes are known and against which the .... 
Between 1911 and 1913, the Danish astronomer Ejnar Hertzsprung... [DOC] [TLE] Star - Conservapedia [PAR] Sep 9, 2016 ... The distance s of the star, in astronomical

Question: Astronomers Henry Russell & Ejnar Hertzsprung devised a diagram displaying the luminosity of these
Answer: stars