Four-hundred Very Metal-Poor Stars Studied with LAMOST and Subaru. II. Elemental abundances

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Haining Li Wako Aoki Tadafumi Matsuno Qianfan Xing Takuma Suda Nozomu Tominaga Yuqin Chen Satoshi Honda Miho N. Ishigaki Jianrong Shi Jingkun Zhao Gang Zhao

摘要： We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. It is the largest high-resolution VMP sample (including 363 new objects) studied by a single program, and the first attempt to accurately determine evolutionary stages for such a large sample based on Gaia parallaxes. The sample covers a wide metallicity range from [Fe/H]=-1.7 down to [Fe/H]=-4.3, including over 110 objects with [Fe/H] 0.7) is in the range of 20-30% for turn-off stars depending on the treatment of objects for which C abundance is not determined, which is much higher than that in giants (~8%). Twelve Mg-poor stars ([Mg/Fe] 1.0) have been discovered in -3.4 <[Fe/H]< -2.0, enlarging the sample of r-process-enhanced stars with relatively high metallicity.

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