Exploring the Convective Core of the Hybrid δ Scuti-γ Doradus Star CoRoT 100866999 with Asteroseismology
Exploring the Convective Core of the Hybrid δ Scuti-γ Doradus Star CoRoT 100866999 with Asteroseismology
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DOI：
10.3847/1538-4357/ab585b
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
Xing-hao Chen;Yan Li;Xiaobin Zhang
中科院分区：
文献类型：
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作者：
Xing-hao Chen;Yan Li;Xiaobin Zhang
我们计算了一个理论模型网格，以拟合先前从 CoRoT 时间序列中检测到的 CoRoT 100866999 的 δ Scuti 频率。脉动主星被确定为主序星，自转周期为数天，自转速度慢于轨道运动。主星的基本参数确定为 、 、 、 K、 、 、 、 和 ，与食光曲线分析获得的参数相匹配。根据模型拟合，p1和p5建议为两个偶极子模式，p3、p4、p6和p7建议为四个四极子模式。特别是，p4 和 p7 被识别为一个五联体的两个组成部分。基于最佳拟合模型，我们发现p1是g模态，其他非径向模态具有明显的混合特征，这对对流核心产生了很强的约束。最后，CoRoT 100866999 对流核心的相对大小确定为 。
We computed a grid of theoretical models to fit the δ Scuti frequencies of CoRoT 100866999 detected earlier from the CoRoT time serials. The pulsating primary star is determined to be a main-sequence star with a rotation period of days, rotating slower than the orbital motion. The fundamental parameters of the primary star are determined to be , , , K, , , , and , matching those obtained from the eclipsing light-curve analysis. Based on the model fittings, p1 and p5 are suggested to be two dipole modes, and p3, p4, p6, and p7 are suggested to be four quadrupole modes. In particular, p4 and p7 are identified as two components of one quintuplet. Based on the best-fitting model, we find that p1 is a g mode and the other nonradial modes have pronounced mixed characters, which give strong constraints on the convective core. Finally, the relative size of the convective core of CoRoT 100866999 is determined to .