LITHIUM ABUNDANCE AS A PREDICTOR OF MASS AND AGE IN SOLAR-ANALOG STARS
LITHIUM ABUNDANCE AS A PREDICTOR OF MASS AND AGE IN SOLAR-ANALOG STARS
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DOI：
10.1088/0004-637x/746/2/143
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
T. Li;S. Bi;Y. Chen;K. Liu;Z. Tian;Z. Ge
中科院分区：
文献类型：
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作者：
T. Li;S. Bi;Y. Chen;K. Liu;Z. Tian;Z. Ge
为了估计恒星的质量和年龄，在给定的恒星质量、金属丰度和自转速度范围内，我们建立了8颗类日恒星的恒星模型网格，包括扩散和旋转诱导混合。通过将恒星模型与包括锂丰度在内的观测数据相结合，我们可以更准确地估计类日恒星的质量和年龄。结果表明，恒星HIP 56948、HIP 73815和HIP 78399是三个可能的太阳双胞胎。此外，我们还发现，在太阳类似物中，由于过度混合而导致的锂耗竭强烈地依赖于质量、金属丰度和转动历史。因此，锂丰度可以作为恒星模型的一个很好的约束条件。
In order to estimate the mass and age of stars, we construct a grid of stellar models for eight solar-analog stars including diffusion and rotation-induced mixing for the given ranges of stellar mass, metallicity, and rotational rate. By combining stellar models with observational data including lithium abundance, we obtain more accurate estimations of mass and age for solar-analog stars. The results indicate that stars HIP 56948, HIP 73815, and HIP 78399 are three possible solar twins. Furthermore, we find that lithium depletion due to extra-mixing in solar analogs strongly depends on mass, metallicity, and rotational history. Therefore, lithium abundance can be used as a good constraint in stellar modeling.