The potential broader complex linked to the key Cepheid SV Vul

Abstract

A new distance was established to the Cepheid SV Vul ($P\simeq 45^d$) and its host cluster Alicante 13, and is tied in part to deeper UKIDSS-DR6 photometry and Gaia DR3 observations ($d=2.30\pm 0.13$ kpc). SV Vul and Alicante 13 possibly belong to a broader coeval stellar complex, which could include Liu-Pang 1738. The clusters and Cepheid share comparable astrometry (e.g., $\ddot{I}{ƒ}_{\ddot{I}}€\simeq 0.02$ mas, $\ddot{I}{ƒ}_{\hat{I}{¼}_{\hat{I}}´}\simeq 0.06$ mas yr${}^{-1}$), and similar cluster turnoffs (ages) exist as indicated by ultraviolet UVEX color-color analyses, Gaia XP spectroscopically differentially dereddened color-magnitude diagrams, and Padova isochrones. Yet SV Vul may be comparatively overluminous. Robust radial velocities for both clusters could substantiate certain hypotheses.

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