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The Valuable Long-period Cluster Cepheid KQ Scorpii and other Calibration Candidates
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abstract
The classical Cepheid KQ Sco is a valuable anchor for the distance scale because of its long pulsation period ($28^{\rm d}.7$) and evidence implying membership in the open cluster UBC 1558. Analyses tied to Gaia DR3 astrometry, photometry, spectroscopy, radial velocities, and 2MASS-VVV photometry indicate a common distance of $2.15\pm0.15$ kpc (\citealt{lin21} DR3 corrections applied). Additional cluster Cepheid candidates requiring follow-up are identified, and it's suggested that a team of international researchers could maintain a cluster Cepheid database to guide the broader community to cases where consensus exists.
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The potential broader complex linked to the key Cepheid SV Vul
SV Vul and its host cluster Alicante 13 lie at 2.30 ± 0.13 kpc and may share a common origin with the nearby cluster Liu-Pang 1738.
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