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Summary

Description This is an example of a Hertzsprung-Russell diagram; a plot of luminosity versus spectral class for a group of stars. The diagonal band labelled "main sequence" is where dwarf stars such as the Sun spend most of their active lifespan. Red giants and supergiants are evolved stars with a mass greater than a red dwarf, that are burning elements heavier than hydrogen. However, White Dwarfs are quite dense, non-luminous, but are still less in mass than supergiants. Once this supply of fuel is exhausted, these stars will migrate to the lower left on this diagram, becoming white dwarfs.
Date
Source This illustration by the contributor is based on Figure 3 (p. 52) of Great Ideas and Theories of Modern Cosmology by Jagjit Singh.[1]
Author Illustraion by R.J. Hall
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Hertzsprung–Russell diagram
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Sun + Sirius sparse
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Well-known stars in the Milky Way
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References

  1. ↑ Jagjit Singh, Great Ideas and Theories of Modern Cosmology 1970, Dover Publications, Inc., New York, ISBN 0-486-20925-3.

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18 December 2006

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Date/TimeThumbnailDimensionsUserComment
current09:59, 24 January 2007Thumbnail for version as of 09:59, 24 January 2007693 × 819 (51 KB)Pngbotoptimized with optipng
15:44, 18 December 2006Thumbnail for version as of 15:44, 18 December 2006693 × 819 (72 KB)RJHallSample Hertzsprung-Russell diagram
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