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Olin Chaddock Wilson was an American astronomer best known for his work as a stellar spectroscopist.
Born in San Francisco, CA as the son of a lawyer, Wilson showed an interest in physics at an early age. He studied astronomy and physics at the University of California, Berkeley and wrote his first scientific paper in 1932 on the subject of the speed of light. He received his PhD from the California Institute of Technology in 1934.
Wilson was a staff member of Mount Wilson Observatory for most of his research career where he studied stellar chromospheres. He was the first scientist to discover activity cycles, similar to the solar 11-year sunspot cycle, in other stars. In collaboration with Vainu Bappu, an Indian astronomer, he also showed that there was a correlation between the width of the Ca II lines in stellar spectra and the star's luminosity, the Wilson-Bappu Effect.
He gave the Henry Norris Russell Lectureship in 1977 and won the Bruce Medal in 1984..
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