1622 M33 cepheids parameters with CFHT/MegaCam

To determine the distance to the M33 galaxy, we performed several analytical steps to identify its Cepheid population. We used the Lomb-Scargle algorithm to find periodicity and visually identified 1989 periodic variable stars.

Since Cepheids occupy a specific region of the color-magnitude diagram, to differentiate Cepheids from other variables we used the expected position of the Cepheid instability strip to down-select Cepheids in M33 from other variables. This led to our sample of 1622 variables, the largest Cepheid sample known in M33 to date. We further classified these Cepheids into different subclasses, and used the fundamental mode Cepheids to estimate distance moduli for M33 in different filters: {mu}=25.044{+/-}0.083mag in the g filter, {mu}=24.886{+/-}0.074mag in the r filter, and {mu}=24.785{+/-}0.068mag for the i filter.