ASTEROSEISMIC ANALYSIS OF THE CoRoT TARGET HD 49933

ASTEROSEISMIC ANALYSIS OF THE CoRoT TARGET HD 49933
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CoRoT 目标 HD 49933 的星震分析

DOI:
10.1088/0004-637x/780/2/152
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发表时间:
2013-11
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Chintarungruangchai, P.
Chintarungruangchai, P.
中科院分区:
其他
文献类型:
--
作者:
Tan, Xiaoyan;He, Xin;Wu, Yaqian;Chintarungruangchai, P.

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HD 49933的频率比R10和R01在高频下表现出增加。这种现象也存在于其他恒星的比例中,这被认为是由于高频端的低信噪比和较大的线宽造成的,在以前的工作中无法用恒星模型来预测。我们的计算表明,这种行为不仅可以用恒星模型再现,而且可以用比值的渐近公式来预测。太阳的频率比也可以用渐近公式很好地再现。这种行为的增加是由于辐射区底部的平均分子质量梯度阻碍了p模的传播,而对流核心中不存在这种阻碍。这种行为应该存在于具有大对流核心的恒星的比例中。高频比的特性对恒星模型提供了严格的约束,并有助于确定对流核的大小和超调的程度。对于HD 49933,观测约束指向一颗恒星:M=1.28±0.01M☉,R=1.458±0.005 R☉,t=1.83±0.1Gyr,RCC=0.16±0.02R☉,α=1.85±0.05,δOv=0.6±0.2。
The frequency ratios r10 and r01 of HD 49933 exhibit an increase at high frequencies. This behavior also exists in the ratios of other stars, which is considered to result from the low signal-to-noise ratio and the larger linewidth at the high-frequency end and could not be predicted by stellar models in previous work. Our calculations show that the behavior not only can be reproduced by stellar models, but can be predicted by asymptotic formulas of the ratios. The frequency ratios of the Sun, too, can be reproduced well by the asymptotic formulas. The increased behavior derives from the fact that the gradient of mean molecular weight at the bottom of the radiative region hinders the propagation of p-modes, while the hindrance does not exist in the convective core. This behavior should exist in the ratios of stars with a large convective core. The characteristic of the ratios at high frequencies provides a strict constraint on stellar models and aids in determining the size of the convective core and the extent of overshooting. Observational constraints point to a star with M = 1.28 ± 0.01 M☉, R = 1.458 ± 0.005 R☉, t = 1.83 ± 0.1 Gyr, rcc = 0.16 ± 0.02 R☉, α = 1.85 ± 0.05, and δov =0.6 ± 0.2 for HD 49933.
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