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About: William P. Bidelman     Goto   Sponge   NotDistinct   Permalink

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William Pendry Bidelman (/ˈbaɪdəlmæn/ BY-dəl-man; September 25, 1918 – May 3, 2011) was an American astronomer.Born in Los Angeles, and raised in North Dakota, he was noted for classifying the spectra of stars, and considered a pioneer in recognizing and classifying sub-groups of the peculiar stars. He co-discovered the class of barium stars with Philip Keenan, the phosphorus and the mercury stars, and was the first to describe the hydrogen-deficient carbon stars.