Evidence for Dynamical Filtering: High Binary Fraction, Hard-binary Excess, and Unresolved Triples in the Surviving Core of NGC 6791
Huanbin Chi; Zhi Li; Feng Wang; Xuefen Tian; Linfeng Chang; Hongbo Liu; Yiqin Liu · 2026 · The Astrophysical Journal
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Abstract
We present a deep photometric analysis of the main-sequence (MS) population in the old, metal-rich open cluster (OC) NGC 6791 using Gaia Data Release 3 data. After correcting for differential reddening, we use the Bayesian model comparison to test whether stellar rotation can account for the observed MS broadening and find that a rotation-dominated interpretation is strongly disfavored. We therefore infer that unresolved multiplicity is the primary contributor to the photometric offsets. We derive a high- q companion fraction of 54.3% ± 2.8% for systems with q ≳ 0.5, significantly higher than
Abstract by Huanbin Chi; Zhi Li; Feng Wang; Xuefen Tian; Linfeng Chang; Hongbo Liu; Yiqin Liu, The Astrophysical Journal (2026) — licensed CC BY 4.0.
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Metadata source: DOAJ · DOI 10.3847/1538-4357/ae690f