8 October 1873|
|Died||21 October 1967
|Alma mater||Copenhagen Polytechnic|
|Known for||Hertzsprung–Russell diagram|
|Notable awards||Bruce Medal 1937|
In 1913 he determined the distances to several Cepheid variable stars by statistical[clarification needed] parallax, and was thus able to calibrate the relationship discovered by Henrietta Leavitt between Cepheid period and luminosity. In this determination he made a mistake, possibly a slip of the pen, putting the stars 10 times too close. He used this relationship to estimate the distance to the Small Magellanic Cloud.
From 1919 to 1946 Hertzsprung worked at Leiden Observatory in The Netherlands, from 1937 as director. 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. The so-called "Hertzsprung–Russell Diagram" has been used ever since as a classification system to explain stellar types and evolution.
Named after him
- Sky & Telescope, January, 1968, Sky Publishing Corporation, Cambridge
- Hertzsprung, E., "Über die räumliche Verteilung der Veränderlichen vom δ Cephei-Typus." Astronomischen Nachrichten, 196 p. 201–210 (1913)
- Bruce Medal page
- Awarding of Bruce Medal: PASP 49 (1937) 65
- Awarding of RAS gold medal: MNRAS 89 (1929) 404
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