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Ejnar Hertzsprung
Danish chemist and astronomer (1873–1967)
Ejnar Hertzsprung (Danish:[ˈɑjnɐˈhɛɐ̯tsˌpʁɔŋ]; 8 October 1873 – 21 October 1967) was a Danish chemist and astronomer.
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Career
Hertzsprung was born in Frederiksberg, Denmark, the son of Severin and Henriette. He studied chemical engineering at Copenhagen Polytechnic Institute, graduating in 1898. After spending two years working as a chemist in St.
Petersburg, in 1901 he studied photochemistry at Leipzig University for a year.[1] His father was an amateur astronomer, which led to Ejnar's interest in the subject. He began making astronomical observations in Frederiksberg in 1902, and within a few years had noticed that stars with similar spectral type could have widely different absolute magnitudes.
In 1909, he took a position at the Göttingen Observatory under director Karl Schwarzschild.[2]
In 1911 Hertzsprung developed the Hertzsprung–Russell diagram, independently developed in 1913 b