English: Phase-folded UBVRI light curves of the prototype Cepheid variable, Delta Cephei, using data by Engle et al. (2014).[1] UBRI light curves are reconstructed from the colours and a 10-term Fourier series fit to the V-band light curve and other necessary colours.
↑ (2014). "The Secret Lives of Cepheids: Evolutionary Changes and Pulsation-induced Shock Heating in the Prototype Classical Cepheid δ Cep". The Astrophysical Journal794: 80. DOI:10.1088/0004-637X/794/1/80.