Six ULA Cepheids light curves

Until now, a few dozen such variable star candidates have been found both in the Large Magellanic Cloud and the Milky Way. In this present work, we studied six ULA Cepheid candidates in the Milky Way, identified by Szabo et al. (2009, in American Institute of Physics Conference Series, Vol. 1170, Stellar Pulsation: Challenges for Theory and Observation, ed.

J.A. Guzik & P.A. Bradley, 102-104) using CoRoT and 2MASS data. In order to identify their positions in the period--luminosity and color-magnitude diagrams, we used the Gaia DR3 parallax and brightness data of each star to calculate their reddening-free absolute magnitudes and distances. Furthermore, we calculated the Fourier parameters (e.g., period and amplitude) of the light variations based on CoRoT and TESS measurements, and established the long-term phase shifts for four out of six stars.