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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.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  ...

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.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 ...

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 ...

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.

www.e-education.psu.edu/astro801/content/l5_p5.html

However, you can also plot a “track” on an HR diagram that represents how the temperature and luminosity of a star changes over time. For example, let's take a  ...

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

Once you know the luminosity and temperature (or color) of a star, you can plot the star as a point on the H-R diagram. Plot the luminosity on the y-axis with ...