A Rare Cepheid-hosting Open Cluster Triad in Sagittarius

Research notes of the AAS Pub Date : 2024-08-22 DOI:10.3847/2515-5172/ad7139

Daniel Majaess, David G. Turner, Igor Usenko

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Abstract

The following Galactic star clusters may constitute a rare Cepheid hosting triad in Sagittarius: M25, NGC 6716, and Collinder 394. The open clusters have comparable ages (τ ≃ 80 Myr) and nearly aligned main-sequences and turnoffs after accounting for differential extinction (A _G,

EBP−RP

). Gaia DR3 astrometry confirms an association between the three clusters, and importantly, the classical Cepheid U Sgr is a member (P ≃ 6.ͩ75, τ ≃ 80 Myr), while DR3 data indicate that the classical Cepheid BB Sgr (P ≃ 6.ͩ64, τ ≃ 80 Myr) could possibly be an escaped member traversing the background field.

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射手座罕见的仙王座寄生疏散星团三联体

下列银河系星团可能构成了人马座中罕见的仙王座三合星：M25、NGC 6716 和 Collinder 394。这些疏散星团的年龄相当（τ ≃80Myr），在考虑了不同的消光（AG、EBP-RP）后，主序和岔道几乎一致。Gaia DR3天体测量证实了这三个星团之间的联系，而且重要的是，经典仙王座U Sgr是其中的一个成员（P ≃ 6.ͩ75，τ ≃80Myr），而DR3数据表明经典仙王座BB Sgr（P ≃ 6.ͩ64，τ ≃80Myr）可能是一个穿越背景场的逃逸成员。

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