Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. II. Radii, Masses, and Ages
Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. II. Radii, Masses, and Ages
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DOI：
10.3847/1538-4357/835/2/173
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发表时间：
2017-02-01
影响因子：
4.9
通讯作者：
Rendle, Ben
中科院分区：
文献类型：
--
作者：
Aguirre, Victor Silva;Lund, Mikkel N.;Rendle, Ben
我们使用开普勒卫星的星震数据来确定该任务至少一整年观测到的 66 个主序目标的基本恒星特性。我们将从每颗恒星的时间序列中提取的数十个单独的振荡频率分配给七个建模团队，他们应用不同的方法来确定样本中所有恒星的半径、质量和年龄。不同结果之间的比较表明，所有恒星特性都具有良好的一致性，考虑到不同团队采用的代码、输入物理和分析方法的多样性，这一点是值得注意的。半径的平均不确定性约为 2%，质量的平均不确定性约为 4%，年龄的平均不确定性约为 10%，这使其成为迄今为止对主序星特征最好的样本。我们预测的初始丰度和混合长度参数根据化学富集定律 Delta Y/Delta Z 的推论和 3D 大气模拟的预测进行检查。我们通过将所确定的恒星属性与太阳、角直径测量、盖亚视差和双星演化进行比较来测试所确定的恒星属性的准确性，在所有情况下都发现了极好的一致性，并进一步证实了当单独的振荡频率可用时，星震确定的恒星物理参数的稳健性。这些恒星被称为开普勒矮星遗产样本，它们是类似太阳的振荡器，在至少未来十年内具有最佳的星震特性。该分析中使用的所有数据以及由此产生的恒星参数均向社区公开。
We use asteroseismic data from the Kepler satellite to determine fundamental stellar properties of the 66 main-sequence targets observed for at least one full year by the mission. We distributed tens of individual oscillation frequencies extracted from the time series of each star among seven modeling teams who applied different methods to determine radii, masses, and ages for all stars in the sample. Comparisons among the different results reveal a good level of agreement in all stellar properties, which is remarkable considering the variety of codes, input physics, and analysis methods employed by the different teams. Average uncertainties are of the order of similar to 2% in radius, similar to 4% in mass, and similar to 10% in age, making this the best-characterized sample of main-sequence stars available to date. Our predicted initial abundances and mixing-length parameters are checked against inferences from chemical enrichment laws Delta Y/Delta Zand predictions from 3D atmospheric simulations. We test the accuracy of the determined stellar properties by comparing them to the Sun, angular diameter measurements, Gaia parallaxes, and binary evolution, finding excellent agreement in all cases and further confirming the robustness of asteroseismically determined physical parameters of stars when individual frequencies of oscillation are available. Baptised as the Kepler dwarfs LEGACY sample, these stars are the solar-like oscillators with the best asteroseismic properties available for at least another decade. All data used in this analysis and the resulting stellar parameters are made publicly available for the community.