A Uniform Census of Variable Stars in M101 Based on HST/ACS Photometry
Abstract
We present a homogeneous HST/ACS F555W/F814W time-series census of variable stars in two M101 disk fields, using a uniform multi-band reduction and reproducible variable-selection workflow for nearby SN-host galaxies. Supplementary archival F555W epochs are used only to refine selected long-period solutions. Candidates are selected with Lomb-Scargle period searches, Fourier light-curve modeling, two-band consistency statistics, artificial-star-test photometric corrections, and mode-aware Cepheid refinement. The final catalog contains 1417 variable-star candidates, including 1102 secure fundamental-mode and 78 secure first-overtone classical Cepheids. Of these secure Cepheids, 420 are newly identified relative to the Shappee & Stanek catalog. The catalog also contains luminous candidates outside the classical Cepheid locus. We release the catalog and source-level two-band light curves for studies of Cepheid physics, stellar variability, and distance-scale applications.
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BibTeX
@misc{wang2026uniform,
title = {{A Uniform Census of Variable Stars in M101 Based on HST/ACS Photometry}},
author = {Jiyu Wang and Xiaodian Chen and Pinjian Chen and Jianxing Zhang and Shu Wang and Licai Deng},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.05825},
eprint = {2609.05825},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.05825},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A Uniform Census of Variable Stars in M101 Based on HST/ACS Photometry
AU - Jiyu Wang
AU - Xiaodian Chen
AU - Pinjian Chen
AU - Jianxing Zhang
AU - Shu Wang
AU - Licai Deng
PY - 2026
DA - 2026/09/05
PB - arXiv
DO - 10.48550/arxiv.2609.05825
UR - https://arxiv.org/abs/2609.05825
AB - We present a homogeneous HST/ACS F555W/F814W time-series census of variable stars in two M101 disk fields, using a uniform multi-band reduction and reproducible variable-selection workflow for nearby SN-host galaxies. Supplementary archival F555W epochs are used only to refine selected long-period solutions. Candidates are selected with Lomb-Scargle period searches, Fourier light-curve modeling, two-band consistency statistics, artificial-star-test photometric corrections, and mode-aware Cepheid refinement. The final catalog contains 1417 variable-star candidates, including 1102 secure fundamental-mode and 78 secure first-overtone classical Cepheids. Of these secure Cepheids, 420 are newly identified relative to the Shappee & Stanek catalog. The catalog also contains luminous candidates outside the classical Cepheid locus. We release the catalog and source-level two-band light curves for studies of Cepheid physics, stellar variability, and distance-scale applications.
ER -