High-dispersion spectra for giants through turnoff stars in the Li 6708 Angstrom region have been obtained and analyzed in the old, metal-deficient open cluster, NGC 2243. When combined with high dispersion data from other surveys, the cluster is found to contain a uniquely peculiar star at the luminosity level of the red clump. The giant is the reddest star at its luminosity, exhibits variability at a minimum 0.1 mag level on a timescale of days, is a single-lined, radial-velocity variable, and has V_sin(i) between 35 and 40 km/sec. In sharp contrast with the majority of the red giant cluster members, the star has a detectable Li abundance, potentially as high or higher than other giants observed to date while at or just below the boundary normally adopted for Li-rich giants. The observed anomalies may be indicators of the underlying process by which the giant has achieved its unusual Li abundance, with a recent mass transfer episode being the most probable within the currently limited constraints.

中文翻译：

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WIYN 开放集群研究。十三一。被卷入法案？奇特的红巨星 NGC 2243-W2135

已经在旧的、缺乏金属的疏散星团 NGC 2243 中获得并分析了 Li 6708 埃区域中巨星通过关闭恒星的高色散光谱。当结合其他调查的高色散数据时，发现该星团包含一个在红团的光度水平上独一无二的恒星。这颗巨星是光度最红的恒星，在几天的时间尺度上表现出最小 0.1 等级的可变性，是一个单线的径向速度变量，并且 V_sin(i) 的速度在 35 到 40 公里/秒之间。与大多数红巨星星团成员形成鲜明对比的是，这颗恒星具有可检测到的锂丰度，可能与迄今为止观察到的其他巨星一样高或更高，同时处于或刚好低于富锂巨星通常采用的边界。