Ejnar hertzsprung astronomy today
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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.
Career
[edit]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 by Henry Norris Russell.
In 1913 Hertzsprung determined the distances to several Cepheid variable stars by parallax,[3] and was thus able to calibrate the relationship, discovered by Henrietta Leavitt, between Cepheid period and luminosity. In this determination he made a mistake, p
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Hertzsprung, Ejnar
Ejnar Hertzsprung: Mapping the Stellar Landscape
Ejnar Hertzsprung, born in 1873 and passing away in 1967, was a Danish astronomer whose pioneering work fundamentally shifted our understanding of stars. His career spanned prestigious institutions across the globe, including Frederiksberg, Copenhagen, Göttingen, Mount Wilson, and finally Leiden, where he served as the Director of the Leiden Observatory from 1935. However, Hertzsprung's legacy extends far beyond his impressive institutional affiliations. His groundbreaking discoveries, particularly the identification of stellar giants and dwarfs, laid the foundation for the Hertzsprung-Russell Diagram, a cornerstone of modern astronomy.
Hertzsprung's journey began with his fascination with photographic techniques. He recognized the potential of using photography to analyze stellar magnitudes and colors. This approach, a departure from traditional visual observations, allowed him to uncover patterns hidden within the vastness of the cosmos. In 1905, while studying stars in the constellation of the Centaur, he made a remarkable discovery: stars of the same spectral type exhibited significant variations in their luminosity. This led him to propose the existence of two distinct populations of stars: giants, r
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Scientist of picture Day - Ejnar Hertzsprung
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