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V725 Sagittarii : ウィキペディア英語版 | V725 Sagittarii
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.〔Swope, H. 1937, Harvard College Observatory Annals, 105, 26, 499〕〔Demers, S. 1973, Journal of the Royal Astronomical Society of Canada, 67, 19.〕 ==References==
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