LP 944-20中的锂
Lithium in LP 944-20
摘要：
本文对棕矮星LP 944-20大气中锂的丰度进行了新的估算。我们的分析是基于低，中，高分辨率的光学和近红外光谱的自洽分析。我们得到log N（Li）= 3.25 +/-0.25，使用我们的合成光谱拟合到用VLT/UVES和AAT/SPIRAL观察到的Li I共振线双峰分布。这一锂丰度比文献中先前的估计大两个数量级以上。为了获得K I和Rb I共振线的良好拟合以及Li I共振线附近TiO分子吸收的良好拟合，我们采用了一个半经验大气模型，其中尘埃云位于光球层上方。然而，锂的丰度并没有因为尘埃云的影响而改变。我们讨论的影响，我们估计的锂丰度在LP 944-20的了解这个基准褐矮星的属性。
英文摘要：
We present a new estimate of the lithium abundance in the atmosphere of the brown dwarf LP 944-20. Our analysis is based on a self-consistent analysis of low, intermediate and high resolution optical and near-infrared spectra. We obtain log N(Li) = 3.25 +/-0.25 using fits of our synthetic spectra to the Li I resonance line doublet profiles observed with VLT/UVES and AAT/SPIRAL. This lithium abundance is over two orders of magnitude larger than previous estimates in the literature. In order to obtain good fits of the resonance lines of K I and Rb I and better fits to the TiO molecular absorption around the Li I resonance line, we invoke a semi-empirical model atmosphere with the dusty clouds located above the photosphere. The lithium abundance, however, is not changed by the effects of the dusty clouds. We discuss the implications of our estimate of the lithium abundance in LP 944-20 for the understanding of the properties of this benchmark brown dwarf.
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