论文标题
对超级锂巨型HD的氦气增强的研究77361
Investigation of the Helium Enhancement in a Super Lithium Rich Giant HD 77361
论文作者
论文摘要
在这项工作中，使用MGH频段和MGI线的强度研究了富含锂（Li-rich）K-巨人HD 77361的氦增强（He-Enhancement）。对HD 77361进行了详细的丰度分析以及MGH频段和MG I系的合成。在不确定性的情况下，MGH和MG I线路都会期望MG和MG I线相同。但是，我们发现，从MGH线中得出的MG丰度明显少于Mg I线的丰度，而这种差异不能通过更改不确定性内的恒星参数来调和，这意味着他在Star的Phostophere中增强了这种差异。通过使用不同的HE/H比率的模型来估计大气中的HE增强，因此，线，MGH和MG I都可以为所采用的模型的HE/H比返回相同的MG丰度。我们发现他/h = 0.4 +/- 0.1是HD 77361的值，HE/H = 0.1的正态值。了解李富巨人的汉堡量是理解负责李和他丰富的场景的强烈线索。讨论了分析和结果。
In this work, the helium-enhancement (He-enhancement) in the lithium-rich (Li-rich) K-giant HD 77361 is investigated using the strengths of the MgH band and the MgI lines. The detailed abundance analysis and also the synthesis of the MgH band and the Mg I lines has been carried out for HD 77361. One would expect, within uncertainties, same Mg abundance from both the MgH and Mg I lines. But, we found that Mg abundance derived from MgH lines is significantly less than the abundance from Mg I lines, and this difference cannot be reconciled by changing the stellar parameters within the uncertainties, implying He enhancement in star's photosphere. The He enhancement in the atmospheres is estimated by using models of different He/H ratios so that both the lines, MgH as well as Mg I, return the same Mg abundance for the adopted model's He/H ratio. We found He/H=0.4+/-0.1 as the value for HD 77361, the normal value of He/H=0.1. Knowing the amount of He-enhancement in the Li-rich giants is a strong clue for understanding the scenarios responsible for the Li and He enrichment. The analysis and results are discussed.
