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History
Frank K. Edmondson
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Frank Kelley Edmondson was an American astronomer.
Edmondson in 1962
Edmondson in 1962
Henry Norris Russell
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Henry Norris Russell ForMemRS HFRSE FRAS was an American astronomer who, along with Ejnar Hertzsprung, developed the Hertzsprung–Russell diagram (1910). In 1923, working with Frederick Saunders, he developed Russell–Saunders coupling, which is also known as LS coupling.
Henry Norris Russell
Henry Norris Russell
Russell at the Fourth Conference International Union for Cooperation in Solar Research at Mount Wilson Observatory, 1910
Russell at the Fourth Conference International Union for Cooperation in Solar Research at Mount Wilson Observatory, 1910