Other major research projects carried out by Haro included the list of 8746 blue stars in the direction of the north galactic pole published jointly with W. J. Luyten in 1961.
He also discovered some of the Sun's nearest neighbors, including Luyten's star as well as the high–proper motion star system Luyten 726-8, which was soon found to contain the remarkable flare star UV Ceti.
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He was the first student to earn his PhD (at the age of 22) with Ejnar Hertzsprung at Leiden University.
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