摘要：We present the largest Cepheid sample in M31 based on the complete Pan-STARRS1 survey of Andromeda(PAndromeda) in the r P1 , i P1 , and g P1 bands. We find 2686 Cepheids with 1662 fundamental-mode Cepheids, 307first-overtone Cepheids, 278 type II Cepheids, and 439 Cepheids with undetermined Cepheid type. Using themethod developed by Kodric et al., we identify Cepheids by using a three-dimensional parameter space of Fourierparameters of the Cepheid light curves combined with a color cut and other selection criteria. This is an unbiasedapproach to identify Cepheids and results in a homogeneous Cepheid sample. The period–luminosity relationsobtained for our sample have smaller dispersions than in our previous work. We find a broken slope that wepreviously observed with HST data in Kodric et al., albeit with a lower significance.
