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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Lithium abundances of F-, G-, and K-type stars: Profile-fitting analysis of the Li 6708 doublet
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Lithium abundances of F-, G-, and K-type stars: Profile-fitting analysis of the Li 6708 doublet

机译：F型，G型和K型恒星的锂丰度：Li 6708双峰的轮廓拟合分析

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摘要

An extensive profile-fitting analysis was performed for the Li(+Fe) 6707-6708 A feature of nearby 160 F-K dwarfs/subgiants (including 27 planet-host stars) in the Galactic disk (7000K greater than or similar to T-eff greater than or similar to 5000K, -1 less than or similar to [Fe/H] less than or similar to +0.4), in order to establish the photospheric lithium abundances of these stars. The non-LTE effect (though quantitatively insignificant) was taken into account based on our statistical equilibrium calculations, which were carried out on an adequate grid of models. Our results confirmed most of the interesting observational characteristics revealed by recently published studies, such as the bimodal distribution of the Li abundances for stars at T-eff greater than or similar to 6000K, the satisfactory agreement of the upper envelope of the A(Li) vs. [Fe/H] distribution with the theoretical models, the existence of a positive correlation between A(Li) and the stellar mass, and the tendency of lower lithium abundances of planet-host stars (as compared to stars without planets) at the narrow "transition" region of 5900K greater than or similar to T-eff greater than or similar to 5800K. The solar Li abundance derived from this analysis is 0.92 (H = 12.00), which is by 0.24 dex lower than the widely referenced standard value of 1.16.
机译：对Li（+ Fe）6707-6708 A进行了广泛的廓线拟合分析，这是银河系盘中附近160个FK矮人/亚生（包括27个行星宿主恒星）的特征（大于或等于T-eff大于7000K大于或等于5000K，-1小于或类似[Fe / H]小于或类似+0.4），以建立这些恒星的光球锂丰度。根据我们的统计均衡计算，考虑了非LTE的影响（尽管在数量上微不足道），这些计算是在适当的模型网格上进行的。我们的结果证实了最近发表的研究结果所揭示的大多数有趣的观测特征，例如，T-eff大于或等于6000K时，恒星的Li丰度的双峰分布，A（Li）的上包络线令人满意与理论模型的[Fe / H]分布，A（Li）与恒星质量之间存在正相关关系，以及行星主恒星（与没有行星的恒星相比）的锂丰度降低的趋势5900K的狭窄“过渡”区域大于或类似于T-eff大于或类似于5800K。从该分析得出的太阳能锂丰度为0.92（H = 12.00），比广泛参考的标准值1.16低0.24 dex。

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