论文标题
Li-rich K巨人，灰尘过剩和二进制
Li-rich K giants, dust excess, and binarity
论文作者
论文摘要
Li-Rich K巨人的起源仍然是高度争议的。在这里，我们使用附着在120万Mercator望远镜上的HERMES光谱仪对11年的11年li富k巨人的样本进行了为期9年的径向速度监测，研究了该家族中二进制的发生率。与13个非LI富裕巨人（其中8个被IRAS，WISE和ISO数据包围）的样本被监测。与190 K巨人的参考样本中的二进制频率相比（包含17.4％的确定光谱二进制物-SB- SB-和6.3％可能的光谱二进制文件-SB？），二进制频率在液化中似乎正常时，在li-rich的巨人中似乎是正常的（2/11二进制二进制的binaries Plus 2 bires thece binailies plose bine bine sb sb sb sb + 18.2％sb + 18.2％）大小通过超几何概率分布。因此，李富集与二进制之间似乎没有因果关系。此外，Li富集与间隔灰尘的存在之间没有相关性，而在Li富集和快速旋转之间可以发现的唯一相关性是，最富含Li的K巨人似乎是快速旋转的星星。但是，在尘土飞扬的K巨人中，二元频率要高得多（4/8确定的二进制组加1个可能的二进制）。其余的3个尘土飞扬的K巨人遭受了径向速度的抖动，正如最发光的K巨人所期望的那样。
The origin of the Li-rich K giants is still highly debated. Here, we investigate the incidence of binarity among this family from a nine-year radial-velocity monitoring of a sample of 11 Li-rich K giants using the HERMES spectrograph attached to the 1.2m Mercator telescope. A sample of 13 non-Li-rich giants (8 of them being surrounded by dust according to IRAS, WISE, and ISO data) was monitored alongside. When compared to the binary frequency in a reference sample of 190 K giants (containing 17.4% of definite spectroscopic binaries -- SB -- and 6.3% of possible spectroscopic binaries -- SB?), the binary frequency appears normal among the Li-rich giants (2/11 definite binaries plus 2 possible binaries, or 18.2% SB + 18.2% SB?), after taking account of the small sample size through the hypergeometric probability distribution. Therefore, there appears to be no causal relationship between Li enrichment and binarity. Moreover, there is no correlation between Li enrichment and the presence of circumstellar dust, and the only correlation that could be found between Li enrichment and rapid rotation is that the most Li-enriched K giants appear to be fast-rotating stars. However, among the dusty K giants, the binary frequency is much higher (4/8 definite binaries plus 1 possible binary). The remaining 3 dusty K giants suffer from a radial-velocity jitter, as is expected for the most luminous K giants, which these are.
