Hertzsprung–Russell 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.

An HR diagram with the instability strip and its components highlighted.

The Hertzsprung–Russell diagram, abbreviated H–R 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 against its temperature (color). It does not map any locations of stars.

单词	H R Diagram
释义	H R Diagram 英语百科 Hertzsprung–Russell diagram The Hertzsprung–Russell diagram, abbreviated H–R 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 against its temperature (color). It does not map any locations of stars.
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H R Diagram

Hertzsprung–Russell diagram