Hertzsprung - Hertzsprung-Russell Diagram In order to...

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Hertzsprung-Russell Diagram In order to better understand how stars are constructed, astronomers look for correlations between stellar properties. The easiest way to do this is make a plot of one intrinsic property vs. another intrinsic property. An intrinsic property is one that does not depend on the distance the star is from the Earth (e.g., temperature, mass, diameter, composition, and luminosity). By the beginning of the 20th century, astronomers understood how to measure these intrinsic properties. In 1912, two astronomers, Ejnar Hertzsprung (lived 1873--1967) and Henry Norris Russell (lived 1877--1957), independently found a surprising correlation between temperature (color) and luminosity (absolute magnitude) for 90% of the stars. These stars lie along a narrow diagonal band in the diagram called the main sequence . This plot of luminosity vs. temperature is called the Hertzsprung-Russell diagram or just H-R diagram for short. Before this discovery astronomers thought that it was just as easy for nature to make a hot dim
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Hertzsprung - Hertzsprung-Russell Diagram In order to...

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