HST/ACS M101 Observations for a Uniform Census of Variable Stars

This DOI collection contains the HST/ACS observations of the M101 disk fields used in the paper “A Uniform Census of Variable Stars in M101 Based on HST/ACS Photometry.” The data include the primary F555W and F814W time-series observations from HST program 10918, which define the uniform parent sample and main two-band variability analysis, together with supplementary ACS F555W observations from archival programs used only to test and refine period solutions for selected long-period candidates. These observations support the construction of a homogeneous variable-star catalog and a secure Classical Cepheid subset in M101.