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V725 Sagittarii (V725 Sgr) is a semiregular pulsating variable star in the constellation of Sagittarius. As recently as a century ago, it was a Population II Cepheid; its transformation was documented by Henrietta Swope beginning in 1937, and is one of the most exciting and instructive events in variable-star astronomy.
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V725 Sagittarii Wikipedia(Text) CC BY-SA