论文标题
对两个新的NA-和AL富含田地巨头的高分辨率光谱研究 - 可能在银河系中的球状簇逃脱
A high-resolution spectroscopic study of two new Na- and Al-rich field giants -- likely globular cluster escapees in the Galactic halo
论文作者
论文摘要
恒星SDSS J064655.6+411620.5和SDSS J193712.01+502455.5是相对明亮的恒星，最初被视为SDSS/Marvels Prevey的一部分。根据HESP-GOMPA调查的一部分（Hanle Echelle Spectrograph--金属贫穷的星星测量，对高分辨率的光谱随访），根据他们的光晕球状簇金属的范围，选择了它们，以及总共60个其他60个其他60个。恒星表现出典型的核合成特征，从所谓的球状簇的第二代恒星预期。检测到MG-AL的光元素抗相关，以及Na的丰度升高。发现碳被耗尽，与期望兼容。 SDSS J064655.6+411620.5和SDSS J193712.01+502455.5也检测到锂。测得的丰度与普通光环巨星的丰度相似。这些明亮的逃生者提供了一个独特的机会，可以详细研究球状簇的核合成事件，并阐明其化学富集历史。
The stars SDSS J064655.6+411620.5 and SDSS J193712.01+502455.5 are relatively bright stars that were initially observed as part of the SDSS/MARVELS pre-survey. They were selected, on the basis of their weak CH $G$-bands, along with a total of 60 others, in the range of halo globular cluster metallicities for high-resolution spectroscopic follow-up as a part of the HESP-GOMPA survey (Hanle Echelle SPectrograph -- Galactic survey Of Metal Poor stArs). The stars exhibit typical nucleosynthesis signatures expected from the so-called second-generation stars of globular clusters. The light-element anti-correlation of Mg-Al is detected, along with elevated abundances of Na. Carbon is found to be depleted, which is compatible with expectation. Lithium is also detected in SDSS J064655.6+411620.5 and SDSS J193712.01+502455.5; the measured abundances are similar to those of normal halo giant stars. These bright escapees provide a unique opportunity to study the nucleosynthesis events of globular clusters in great detail, and shed light on their chemical-enrichment histories.
