标题： OO Dra：通过振荡学揭示的极氦贫乏质量吸积形成的Algol型双星 显示英文标题

标题： OO Dra: an Algol-type binary formed through an extremely helium-poor mass accretion revealed by asteroseismology

摘要： 基于两分钟的TESS数据，我们分析了主星成分的固有振荡，并识别出七个可靠的独立$\delta$振频（$f_1$、$f_2$、$f_3$、$f_4$、$f_7$、$f_{11}$和$f_{12}$）。 单星演化模型和吸积质量模型都被计算以重现$\delta$ Scuti频率。它们的拟合结果彼此非常吻合。 通过星震学得到的主星的恒星参数为$M$ = $1.92^{+0.10}_{-0.02}$ $M_{\odot}$ ，$Z$ = 0.011$^{+0.006}_{-0.001}$，$R$ = $2.068^{+0.050}_{-0.007}$ $R_{\odot}$ ，$\log g$ = $4.090^{+0.010}_{-0.002}$，$T_{\rm eff}$ = $8346^{+244}_{-320}$ K，$L$ = $18.65^{+3.31}_{-2.82}$ $L_{\odot}$ ，这些参数与双星模型的动力学参数很好地吻合。 此外，我们的星震学结果表明，OO Dra是一个刚刚经历快速物质转移阶段的另一个大陵型系统。 单一恒星演化模型拟合结果表明，脉动星是一颗贫氦星，年龄为8.22$^{+0.12}_{-1.33}$兆年，进一步的质量吸积模型显示，主星看起来像一个几乎未演化的星，在A演化场景中由极端贫氦质量吸积形成。 显示英文摘要

摘要： Based on the two-minutes TESS data, we analyzed intrinsic oscillations of the primary component and identified seven confident independent $\delta$ Scuti frequencies ($f_1$, $f_2$, $f_3$, $f_4$, $f_7$, $f_{11}$, and $f_{12}$). Both of single-star evolutionary models and mass-accreting models are computed to reproduce the $\delta$ Scuti freqiencies. Fitting results of them match well with each other. The stellar parameters of the primary star yielded by asteroseismology are $M$ = $1.92^{+0.10}_{-0.02}$ $M_{\odot}$, $Z$ = 0.011$^{+0.006}_{-0.001}$, $R$ = $2.068^{+0.050}_{-0.007}$ $R_{\odot}$, $\log g$ = $4.090^{+0.010}_{-0.002}$, $T_{\rm eff}$ = $8346^{+244}_{-320}$ K, $L$ = $18.65^{+3.31}_{-2.82}$ $L_{\odot}$, which match well with the dynamic ones by the binary model. Furthermore, our asteroseismic results show that OO Dra is another Algol system that has just undergone the rapid mass-transfer stage. Fitting results of single-star evlutionary models indicate that the pulsator is helium-poor star with an age of 8.22$^{+0.12}_{-1.33}$ 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 Case A evolutionary scenario.