in astronomy, graph![Superposition of colour-luminosity arrays of several galactic clusters and of one globular cluster …[Credits : From Otto Struve, Elementary Astronomy, copyright © 1959 by Oxford University Press, Inc.; reprinted by permission]](http://media-2.web.britannica.com/eb-media/72/7672-003-637C6161.gif)
showing the relation between the absolute magnitudes (brightnesses) of stars and their colours, which are closely related to their temperatures and spectral types. It is similar to the Hertzsprung-Russell diagram except that the latter plots spectral types instead of colours.
Superposition-of-colour-luminosity-arrays-of-several-galactic-clusters-andSuperposition of colour-luminosity arrays of several galactic clusters and of one globular cluster …[Credits : From Otto Struve, Elementary Astronomy, copyright © 1959 by Oxford University Press, Inc.; reprinted by permission]
Colour-magnitude-diagram-for-an-old-globular-cluster-made-upColour-magnitude (Hertzsprung-Russell) diagram for an old globular cluster made up of Population II …[Credits : From Astrophysical Journal, reproduced by permission of the American Astronomical Society]
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