V725 Sgr

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V725 Sgr is a semiregular pulsating variable star in the constellation 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.^{[1] [2]}

[edit] Notes

1. ^ Swope, H. 1937, Harvard College Observatory Annals, 105, 26, 499
2. ^ Demers, S. 1973, Journal of the Royal Astronomical Society of Canada, 67, 19.