US astronomer and mathematician who published a catalogue of nearly 3,000 radial velocities of stars 1928. His spectroscopic observations of Nova Auriga 1892 enabled him to describe the changes in its spectral pattern with time.
Campbell was born in Hancock, Ohio, and studied at the University of
Michigan. From 1891 he worked at the newly established Lick Observatory,
California, becoming director of the observatory 1901-30. There he was
responsible for much of the spectroscopic work undertaken and was an
active participant in and organizer of seven eclipse expeditions to
many parts of the world.
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