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Ejnar Hertzsprung (, 8 October 1873 – 21 October 1967 ) was a Danish chemist and astronomer.
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Ejnar and Hertzsprung
These color-magnitude plots are known as Hertzsprung – Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell.
In Potsdam in 1906, the Danish astronomer Ejnar Hertzsprung noticed that the reddest stars — classified as K and M in the Harvard scheme — could be divided into two distinct groups.
The first color-magnitude diagrams of open clusters were published by Ejnar Hertzsprung in 1911, giving the plot for the Pleiades and Hyades star clusters.
He befriended fellow students Bart Bok and Pieter Oosterhoff and was taught by Ejnar Hertzsprung, Antonie Pannekoek, Willem de Sitter, Jan Woltjer, Jan Oort and the physicist Paul Ehrenfest.
* 1910 — Ejnar Hertzsprung and Henry Norris Russell study the relation between magnitudes and spectral types of stars
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Ejnar and –
* A. Ejnar Farstrup 1960 – 1962
* Ejnar Mindedal Rasmussen ( 1892 – 1975 ), Danish architect
Ejnar and was
Using this period-luminosity relation, in 1913 the distance to the SMC was first estimated by Ejnar Hertzsprung.
The term was originally coined in 1906 when the Danish astronomer Ejnar Hertzsprung noticed that the reddest stars — classified as K and M in the Harvard scheme — could be divided into two distinct groups.
In 1935 he became professor at the observatory of the University of Leiden, where Ejnar Hertzsprung was the director.
He was the first student to earn his PhD ( at the age of 22 ) with Ejnar Hertzsprung at Leiden University.
Weber was born in London, the son of Susan Ann Caroline ( née Coriat ), a British socialite, and Thomas Evelyn " Tommy " Weber ( originally Thomas Ejnar Arkner ), a race car driver who also came from a wealthy family.
The name was proposed by members of BGLE for Ejnar Mikkelsen, Danish Arctic explorer and Inspector for East Greenland, 1934-50.
Ejnar and Danish
In 1933, Ejnar Sylvest gave a doctoral thesis describing a Danish outbreak of this disease on Bornholm Island entitled, " Bornholm disease-myalgia epidemica ", and this name has persisted.
He gave the name Mikkelsen Island after Ejnar Mikkelsen, Danish Arctic explorer.
Ejnar and .
In 1913, Ejnar Hertzsprung did some work on Cepheids, which needed some revision.
However, Ejnar Hertzsprung realized the value of her classifications and used them in his system of identifying giant and dwarf stars.
Recruited by Ejnar Mikkelsen and Ernest de Koven Leffingwell for their Anglo-American Polar Expedition, he lived with the Inuit of the Mackenzie Delta during the winter of 1906-07, returning alone across country via the Porcupine and Yukon Rivers.
A number of prominent astronomers and physicists have done work at Leiden Observatory, including Willem de Sitter, Ejnar Hertzsprung, and Jan Oort, all of whom have served as Directors.
Some cairn reports, left at Danmark Fjord by Mylius-Erichsen, were found and brought to Copenhagen by Ejnar Mikkelsen in 1912.
* Report on the nonexistence of Peary Channel in Meddelelser om Grønland, ( 50 volumes, Copenhagen, 1876-1912 ), volume xli ( 1913 ), edited by Ejnar Mikkelsen.
* Johansson, Ejnar: Wilhelm Bendz, Spektrum, 1995.
København: Ejnar Munksgaard.
København: Ejnar Munksgaard.
Ejnar Hertzsprung establishes the standard for measuring the true brightness of a star.
A new feature, Mikkelsen Bay, has been named for Ejnar Mikkelsen.
0.102 seconds.