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arXiv 2106.10752astro-ph.SR
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恒星结构与演化的测试模型I。与分离双星系的比较

Testing Models of Stellar Structure and Evolution I. Comparison with Detached Eclipsing Binaries

Carlos del Burgo, Carlos Allende Prieto

摘要:

我们提出的分析结果,旨在测试的准确性和精度的PARSEC v1.2S库的恒星演化模型,在贝叶斯框架,推断恒星参数。我们主要采用Southworth的在线DEBCat目录,这是一个独立食双星系统的汇编,其质量和半径的测量结果已公布,精度为$\sim$ 2%。我们选择了一个样本的318个二进制组件,质量在0.10和14.5 Msun之间,在1.3 pc和~ 8 kpc的银河系天体和~ 44-68 kpc的河外天体的距离。应用贝叶斯分析作为输入的有效温度,半径,和[Fe/H],以及它们的不确定性,返回其他恒星参数的理论预测。从与动力学质量的比较中,我们得出结论,推断的质量是精确地推导出的恒星的主序星和核心氦燃烧阶段,与4%和7%的不确定性,分别平均。亚巨星和红巨星的质量预测值在14%以内,早期渐近巨星分支星的质量预测值在24%以内,这些结果有助于进一步改进模型,特别是对于我们理解有限的高级演化阶段。我们获得的距离和年龄的二元系统,并比较它们,只要有可能,与精确的文献估计,找到很好的协议。我们讨论了进化的影响和挑战推断恒星年龄的进化模型。我们还提供了有用的多项式拟合理论零年龄主序列的关系。

英文摘要:

We present the results of an analysis aimed at testing the accuracy and precision of the PARSEC v1.2S library of stellar evolution models, in a Bayesian framework, to infer stellar parameters. We mainly employ the online DEBCat catalogue by Southworth, a compilation of detached eclipsing binary systems with published measurements of masses and radii to $\sim$ 2 per cent precision. We select a sample of 318 binary components, with masses between 0.10 and 14.5 Msun, at distances between 1.3 pc and ~ 8 kpc for Galactic objects and ~ 44-68 kpc for extragalactic ones. The Bayesian analysis applied takes as input effective temperature, radius, and [Fe/H], and their uncertainties, returning theoretical predictions for other stellar parameters. From the comparison with dynamical masses, we conclude that the inferred masses are precisely derived for stars on the main-sequence and in the core-helium-burning phase, with uncertainties of 4 per cent and 7 per cent, respectively, on average. Masses for subgiants and red giants are predicted within 14 per cent, and those for early asymptotic giant branch stars within 24 per cent. These results are helpful to further improve the models, in particular for advanced evolutionary stages for which our understanding is limited. We obtain distances and ages for the binary systems and compare them, whenever possible, with precise literature estimates, finding excellent agreement. We discuss evolutionary effects and challenges for inferring stellar ages from evolutionary models. We also provide useful polynomial fittings to theoretical zero-age main-sequence relationships.

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