论文标题
发现具有最高超锂增强的金属贫红色巨星
Discovery of a Metal-Poor Red Giant Star with the Highest Ultra-Lithium Enhancement
论文作者
论文摘要
我们介绍了2个MASS J05241392-0336543（以下简称J0524-0336），这是一种非常贫穷的（[FE/H] = -2.43 +-0.16），高度R-process-enhanced（[EU/Fe] = +1.34 +-0.10）MILKY MILKY MILKY MILKY FIELD RODARES a（li）（3d，nlte）= 6.15 +-0.25和[li/fe] = +7.64 +-0.25。这使J0524-0336成为迄今为止发现的最具锂增强的巨星。我们对恒星的大气恒星参数和化学丰度确定进行了详细分析。此外，我们检测到红外过量的适应症，并观察到在多个时期内H_Alpha吸收线的机翼中发射可变，这表明可能增强的质量损坏事件，并可能流出。我们的分析表明，J0524-0336位于颠簸和红色巨型分支（RGB）的尖端之间，或者是早期的杂种巨型分支（E-AGB）。我们研究了J0524-0336中锂富集的可能来源，包括内部和外部来源。根据当前模型和我们收集的观察证据，我们的研究表明，J0524-0336可能正在经历所谓的锂闪光，当它们达到RGB凸起和/或早期AGB时，该锂闪光预计会发生在低质量恒星中。
We present the discovery of 2MASS J05241392-0336543 (hereafter J0524-0336), a very metal-poor ([Fe/H]=-2.43 +- 0.16), highly r-process-enhanced ([Eu/Fe]= +1.34 +- 0.10) Milky Way halo field red giant star, with an ultra high Li abundance of A(Li)(3D,NLTE)= 6.15 +- 0.25 and [Li/Fe]= +7.64 +- 0.25, respectively. This makes J0524-0336 the most lithium-enhanced giant star discovered to date. We present a detailed analysis of the star's atmospheric stellar parameters and chemical abundance determinations. Additionally, we detect indications of infrared excess, as well as observe variable emission in the wings of the H_alpha absorption line across multiple epochs, indicative of a potential enhanced mass-loss event with possible outflows. Our analysis reveals that J0524-0336 lies either between the bump and the tip of the Red Giant Branch (RGB), or on the early-Asymptotic Giant Branch (e-AGB). We investigate the possible sources of lithium enrichment in J0524-0336, including both internal and external sources. Based on current models and on the observational evidence we have collected, our study shows that J0524-0336 may be undergoing the so-called lithium flash that is expected to occur in low-mass stars when they reach the RGB bump and/or the early-AGB.
