2021ApJ...920...76C

Based on 2 minutes of Transiting Exoplanet Survey Satellite data, we analyzed intrinsic oscillations of the primary component and identified seven confident independent δ Scuti frequencies (f₁, f₂, f₃, f₄, f₇, f₁₁, and f₁₂). Both single-star evolutionary models and mass-accreting models are computed to reproduce the δ Scuti frequencies and the fitting results match well with each other. The stellar parameters of the primary star yielded by asteroseismology are M = 1.92_–0.02^+0.10M_☉, Z = 0.011_–0.001^+0.006, R = 2.068_–0.007^+0.050R_☉, logg = 4.090_–0.002^+0.010, T_eff = 8346_–320⁺²⁴⁴ K, and L = 18.65_–2.82^+3.31L_☉, which match well with the dynamic ones using the binary model. Furthermore, our asteroseismic results show that OO Dra is another Algol system that has just undergone the rapid mass-transfer stage. The fitting results of single-star evolutionary models indicate that the pulsator is a helium-poor star with an age of 8.22_–1.33^+0.12 Myr, and the further mass-accreting models show that the primary star looks like an almost unevolved star formed by an extremely helium-poor mass accretion in the Case A evolutionary scenario.