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KIC 3868420: A High-amplitude δ Scuti–γ Dor Hybrid Star Crossing the Hertzsprung Gap
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KIC 3868420: A High-amplitude δ Scuti–γ Dor Hybrid Star Crossing the Hertzsprung Gap
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Journal Article
KIC 3868420: A High-amplitude δ Scuti–γ Dor Hybrid Star Crossing the Hertzsprung Gap
2026
Overview
We report a photometric and asteroseismic analysis of KIC 3868420, a newly identified high-amplitude δ Scuti–γ Doradus hybrid star located in the Hertzsprung gap—a short-lived and rarely observed post-main-sequence phase. Using 4 yr of Kepler long-cadence photometry, we detect 36 significant frequencies, including 11 independent modes spanning both low- and high-frequency regimes. Grid-based modeling with MESA and GYRE, including rotation, shows that five independent frequencies match a combination of radial p-modes and nonradial g-modes, supporting its hybrid nature. The best-fit models yield an evolved post-main-sequence star (M ∼ 2.26–2.30M⊙, R ∼ 4.41–4.43R⊙, and τ ∼ 5.4 × 108 yr), although degeneracies from rotation and unknown inclination preclude a unique solution. KIC 3868420 thus represents a rare example of a high-amplitude hybrid pulsator in the Hertzsprung gap, demonstrating that high-amplitude pulsation can coexist with mixed p-/g-mode behavior in a rapidly evolving star. This finding highlights the value of space-based photometry for identifying such rare objects.
Publisher
IOP Publishing
Subject
