Roy Axelsen has published a paper on high amplitude δ Scuti stars V1338 Centauri, V1430 Scorpii, and V1307 Scorpii in the JAAVSO.
Digital Single Lens Reflex (DSLR) photometry of the high amplitude δ Scuti stars V1338 Centauri, V1430 Scorpii, and V1307 Scorpii was taken during the southern autumn and winter of 2015. Fourier analysis revealed pulsation frequencies corresponding to periods very close to those previously reported with significant contributions from harmonics. Only in the case of V1430 Scorpii was another independent frequency detected. The oscillation periods were refined by calculating linear ephemerides based on previously published epochs for each star, and the epochs determined by the author. These periods are: V1338 Centauri, 0.13093808 d; V1430 Scorpii, 0.08377709 d; and V1307 Scorpii, 0.11703066 d.
Axelsen, R. (2015). Recently Refined Periods for the High Amplitude d Scuti Stars V1338 Centauri, V1430 Scorpii, and V1307 Scorpii. 43, 182. Retrieved from https://www.aavso.org/media/jaavso/3122_8vnxSPr.pdf