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- He had no formal education in astronomy but studied in technological colleges in Denmark and became a chemical engineer. Keenly interested in the chemistry of photography, he turned to astronomy in 1902, working in small Danish observatories, where he applied photography to the measurement of starlight.
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Ejnar Hertzsprung was a Danish astronomer who classified types of stars by relating their colour to their absolute brightness—an accomplishment of fundamental importance to modern astronomy. The Hertzsprung-Russell diagram of stellar types was named (in part) for him.
- The Editors of Encyclopaedia Britannica
Perhaps his greatest contribution to astronomy was the development of a classification system for stars to divide them by spectral type, stage in their development, and luminosity. He used the earlier classification system developed by Antonia Maury in his work. [4]
Ejnar Hertzsprung introduced the concept of absolute magnitude, the intrinsic brightness of a star. He worked out the relationship between a star's brightness and its color (which indicates its surface temperature) at different stages in its evolution.
Ejnar Hertzsprung studied chemical engineering in Copenhagen, worked as a chemist in St. Petersburg, and studied photochemistry in Leipzig before returning to Denmark in 1901 to become an independent astronomer.
Hertzsprung-Russell diagram, in astronomy, graph in which the absolute magnitudes (intrinsic brightness) of stars are plotted against their spectral types (temperatures). Of great importance to theories of stellar evolution, it evolved from charts begun in 1911 by the Danish astronomer Ejnar Hertzsprung and independently by the U.S. astronomer ...
- The Editors of Encyclopaedia Britannica
The Hertzsprung–Russell diagram (abbreviated as H–R diagram, HR diagram or HRD) is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities and their stellar classifications or effective temperatures.
May 9, 2018 · Early in the twentieth century, when Hertzsprung entered the field of astronomy, study of the physical nature of stars was still in its infancy. Stellar astronomy during the nineteenth century had been directed mainly toward determining positions and motions of the stars.
