A search for open cluster Cepheids in the Galactic plane
Xiaodian Chen (1,2,3), Richard de Grijs (1,2), Licai Deng (3) ((1), Kavli Institute for Astronomy, Astrophysics, Peking University (2), Department of Astronomy, Peking University (3) Key Laboratory for Optical, Astronomy, National Astronomical Observatories

TL;DR
This study systematically searches for open cluster Cepheids in the Galactic plane using updated catalogs, applying multiple criteria and NIR analysis to identify and confirm new OC Cepheids and refine their period-luminosity relation.
Contribution
It introduces a comprehensive method combining isochrone fitting and proper motion analysis to identify new OC Cepheids and improves the NIR period-luminosity relation for these objects.
Findings
Nineteen OC Cepheids identified with NIR data
Eight potential OC Cepheid pairs lacking NIR data
New high-probability OC Cepheids confirmed in NIR analysis
Abstract
We analyse all potential combinations of Galactic Cepheids and open clusters (OCs) in the most up-to-date catalogues available. Isochrone fitting and proper-motion calcula- tion are applied to all potential OC{Cepheid combinations. Five selection criteria are used to select possible OC Cepheids: (i) the Cepheid of interest must be located within 60 arcmin of the OC's centre; (ii) the Cepheid's proper motion is located within the 1 sigma distribution of that of its host OC; (iii) the Cepheid is located in the instability strip of its postulated host OC; (iv) the Cepheid and OC distance moduli should differ by less than 1 mag; and (v) the Cepheid and OC ages (and, where available, their metal- licities) should be comparable: {\Delta}log(t yr^-1) < 0.3. Nineteen possible OC Cepheids are found based on our near-infrared (NIR) analysis; eight additional OC{Cepheid associations may be genuine…
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