在银河系厚盘中是否有大量的贫金属恒星和行星？
Is there plenty of metal-poor stars with planets in the Galactic thick disk?
摘要：
我们对1111颗FGK矮星进行了统一的光谱分析，这是HARPS GTO行星搜索计划的一部分。我们采用了一种纯粹的化学方法，基于[α/Fe]比，以区分银河系中的各种恒星成分。除了众所周知的银河系厚盘和薄盘之外，我们还分离出了一个超太阳金属丰度的α增强恒星家族。富含金属的高α星的轨道与薄盘星相似，但它们的年龄与厚盘星相似。我们的数据表明，在[Fe/H] <-0.3dex的化学分离厚盘星中，有行星的恒星发生率比在相同[Fe/H]间隔的薄盘星中大。我们的研究结果使我们能够假设某种化学成分，而不是恒星的银河系诞生地，是导致这种情况的因素。
英文摘要：
We performed an uniform spectroscopic analysis of 1111 FGK dwarfs observed as part of the HARPS GTO planet search program. We applied a purely chemical approach, based on [alpha/Fe] ratio, to distinguish the various stellar components in the Galaxy. Apart from the well known Galactic thick and thin disks, we separated an alpha-enhanced stellar family at super-solar metallicities. The metal-rich high-alpha stars have orbits similar to the thin disk stars, but they are similar to thick disk stars in terms of age. Our data indicate that the incidence of stars with planets are greater among the chemically separated thick disk stars with [Fe/H] < -0.3 dex than they are among thin disk stars in the same [Fe/H] interval. Our results allow us to suppose that a certain chemical composition, and not the Galactic birth place of the stars, is the causative factor for that.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
