M33 Cepheids from CFHT/MegaCam Survey

Abstract In this paper we analyze Sloan g, r, i archival imaging data of M33 taken by Hartman et al. using MegaCam at the Canada–France–Hawaii Telescope. To determine distance to galaxy, performed several analytical steps identify its Cepheid population. We used Lomb–Scargle algorithm find periodicity and visually identified 1989 periodic variable stars. Since Cepheids occupy a specific region color–magnitude diagram, differentiate from other variables expected position instability strip down-select in variables. This led our sample 1622 variables, largest known date. further classified these into different subclasses, fundamental mode estimate moduli for filters: μ = 25.044 ± 0.083 mag g filter, 24.886 0.074 r 24.785 0.068 filter. These results are agreement with previous results.