HD 77361：一个12 C/13 C比值异常低的超富锂K巨星的新事例
HD 77361: A new case of super Li-rich K giant with anomalous low 12C/13C ratio
摘要：
本文报道了HD 77361的高分辨光谱分析结果。LTE分析表明HD 77361是一颗K巨星，其大气参数为：Teff = 4580 +/- 75 K，log $g$ = 2.5 +/- 0.1，τ_{t} = 1.40 +/-0.5 km/s。我们发现HD 77361的大气层高度富集Li，log ε（Li）= 3.82 +/- 0.1。有了这个发现，迄今为止已知的超级富锂K巨星（log ε（Li）>= 3.3 ISM值）的总数达到了6个。与第一次挖掘，超深混合和相关的冷底处理，以及其他最近对K巨星在RGB光度凸点阶段的预测相反，HD 77361显示出非常低的12 C/13 C = 4.3 +/- 0.5，同时具有非常大量的Li。此外，HD 77361是目前已知的超级富锂K巨星中唯一一颗12 C/13 C比值非常低的第一星族低光度（log L/L_sun = 1.66 +/- 0.1）低质量K巨星（M = 1.5 +/- 0.2M_sun）。HD 77361的结果进一步限制了我们对RGB恒星大气中Li增强的理论理解。
英文摘要：
Results from high resolution spectroscopic analysis of HD 77361 are reported. The LTE analysis shows that HD 77361 is a K giant of atmospheric parameters: Teff = 4580 +/- 75 K, log$g$ = 2.5 +/- 0.1, and ξ_{t} = 1.40 +/-0.5 km/s. We found that the atmosphere of HD 77361 is highly enriched in Li with log ε(Li) = 3.82 +/- 0.1. With this finding the total number of super Li-rich K giants (log ε(Li) >= 3.3 ISM value) known till date reached six. Contrary to first dredge-up, extra-deep mixing and the associated cool bottom processing, and other recent predictions for K giants on the RGB luminosity bump phase, HD 77361 shows very low value of 12C/13C = 4.3 +/- 0.5 having, simultaneously, very large amount of Li. Also, HD 77361 is the only population I low luminosity (log L/L_sun = 1.66 +/- 0.1) low mass K giant (M = 1.5 +/- 0.2M_sun) among the known super Li-rich K giants that has a very low 12C/13C ratio. Results of HD 77361 further constrain our theoretical understanding of Li enhancement in the atmospheres of RGB stars.
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