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en.wikipedia.org/wiki/Hertzsprung%E2%80%93Russell_diagram

An HR diagram showing many well known stars in the Milky Way galaxy. HR diagrams for two open clusters, M67 and NGC 188, showing the main-sequence turn-off at different ages. The Hertzsprung–Russell diagram, abbreviated H–R diagram or HRD, is a scatter plot of stars ...

www.atnf.csiro.au/outreach/education/senior/astrophysics/stellarevolution_hrintro.html

One of the most useful and powerful plots in astrophysics is the Hertzsprung- Russell diagram (hereafter called the H-R diagram). It originated in 1911 when the ...

www.atnf.csiro.au/outreach/education/senior/cosmicengine/stars_hrdiagram.html

These can be plotted to form what is one of the most useful plots for stellar astronomy, the Hertzsprung-Russell (or H-R) diagram. It is named after the Danish ...

www.astro.cornell.edu/academics/courses/astro201/hr_diagram.htm

The Hertzsprung-Russell Diagram is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and ...

astronomy.swin.edu.au/cosmos/H/Hertzsprung-Russell+Diagram

The Hertzsprung-Russell diagram (HR diagram) is one of the most important tools in the study of stellar evolution. Developed independently in the early 1900s  ...

astro.unl.edu/naap/hr/hr_background3.html

That was not the case however, for the Hertzsprung-Russell diagram. A significant tool to aid in the understanding of stellar evolution, the H-R diagram was ...

astro.unl.edu/naap/hr/animations/hrExplorer.html

Size Comparison. a. HR Diagram. Cursor Properties. temperature: K. 5800. 123456789.0eE-+. label and unit. luminosity: L. 1.0. 1.00. 0.001 R. 0.01 R. 0.1 R. 1 R.

abyss.uoregon.edu/~js/ast122/lectures/lec11.html

These diagrams, called the Hertzsprung-Russell or HR diagrams, plot luminosity in solar units on the Y axis and stellar temperature on the X axis, as shown ...

skyserver.sdss.org/dr1/en/proj/advanced/hr

Find stars in the Sloan Digital Sky Survey's database of 13 million objects. Follow in the footsteps of famous astronomers as you learn how stars live and die.

stars.astro.illinois.edu/sow/hrd.html

The classical HR diagram, first constructed in 1914 by Henry Norris Russell (to which was added the work of Ejnar Hertzsprung), is a plot of absolute visual ...