论文标题
银河系磁盘中金属丰富的高分子星的化学动力学分析
Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
论文作者
论文摘要
我们介绍了11,562个金属富含高分子晕圈的主序列（MS）恒星的化学动力学分析，该星星被称为Sloan Digital Sky Survey（SDSS）和大型Sky Area Multi-Objection Multi-Objection fiber Specopic telescope（Lamost）。当分为两组时，基于运动学和化学的低 - [$α$/fe]种群（lap）和高 - [$α$/fe]种群（HAP），我们发现它们表现出非常不同的特性，表明了不同的起源。通过对它们的轨道倾斜的详细分析，我们建议HAP来自大量的加热磁盘恒星（约90％）的恒星（约90％）和来自Starburst种群的原位恒星的一小部分（约10％），这可能是由于与Gaia Sausage/Enceladus/Ecceladus/Ecceladus/其他早期合并的相互作用引起的。圈圈包括大约一半的GSE恒星，由GSE引起的Starburst形成一半。我们的发现进一步暗示，我们样品中的飞溅恒星起源于至少三种不同的机制 - 积聚，磁盘加热和合并引起的starburst。
We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence (MS) stars, which has been referred to as the Splash or Splashed Disk, selected from Sloan Digital Sky Survey (SDSS) and Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). When divided into two groups, a low-[$α$/Fe] population (LAP) and a high-[$α$/Fe] population (HAP), based on kinematics and chemistry, we find that they exhibit very distinct properties, indicative of different origins. From a detailed analysis of their orbital inclinations, we suggest that the HAP arises from a large fraction (~ 90%) of heated disk stars and a small fraction (~ 10%) of in situ stars from a starburst population, likely induced by interaction of the Milky Way with Gaia Sausage/Enceladus (GSE) or other early merger. The LAP comprises about half accreted stars from the GSE and half formed by the GSE-induced starburst. Our findings further imply that the Splash stars in our sample originated from at least three different mechanisms - accretion, disk heating, and a merger induced starburst.
