Abstract
IN connexion with the recent announcement that Prof. Ejnar Hertzsprung, professor of astrophysics in the University of Ley den, and assistant director of the Leyden Observatory, has been appointed director of the Observatory to succeed the late Prof. W. de Sitter, it may be recalled that Prof. Hertzsprung was awarded the Gold Medal of the Royal Astronomical Society in 1929. Prof. Hertzsprung's work covers an extremely wide range of astronomical subjects, and he has contributed to our knowledge in nearly every branch of the science. In particular, he is known for his work on double stars and on the clusters. The mass luminosity relation, the division of the late type stars into giants and dwarfs, and the connexion between absolute magnitude and spectral type (the famous ‘seven diagram’) are all associated with his name (together with that of Prof. H. N. Russell, of Princeton). He will have as his assistant director at Leyden, Dr. J. Oort, who is also well known in Great Britain, chiefly on account of his work on galactic rotation.
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Prof. Ejnar Hertzsprung. Nature 136, 825 (1935). https://doi.org/10.1038/136825b0
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DOI: https://doi.org/10.1038/136825b0