S Sagittae
... that the star S Sagittae changes its radius, temperature, luminosity, and colour over an eight-day period?
... that the star <b id="mwCDo"><a href="./S_Sagittae" id="mwCDs" rel="mw:WikiLink" title="S Sagittae">S Sagittae</a></b> changes its radius, temperature, luminosity, and colour over an eight-day period?