论文标题
一颗标记所有标签的恒星（OSTTA）：I。径向速度和20个研究不足的开放式簇的化学速度
One Star to Tag Them All (OSTTA): I. Radial velocities and chemical abundances for 20 poorly studied open clusters
论文作者
论文摘要
背景：开放群集是研究各种天体物理主题的理想实验室，从银河盘的特性到出色的演化模型。为此，我们需要详细了解它们的化学成分。不幸的是，由高分辨率光谱法确定的具有化学丰度的系统数量仍然很少。目的：我们的目的是通过在先前未研究的群集中采样几颗恒星来增加径向速度和化学丰度的开放簇数量。方法：我们获得了高分辨率光谱仪的高分辨率光谱仪，而不是属于20个开放群集的41颗恒星。这些恒星具有较高的天文会员概率，从盖亚第二个数据发布确定。结果：我们为所有观察到的恒星得出了径向速度，这些恒星用于确认其成员身份到相应的簇。对于Gulliver \，37我们无法确定观察到的星是真正的成员。我们得出了32颗恒星被视为真实群集成员的大气参数。我们丢弃了五颗恒星，因为由于低信噪比光谱，它们的重力非常低或大气参数没有适当地限制。因此，确定了属于17个簇的28颗恒星的详细化学丰度。对于大多数人来说，这是文献中第一次可用的化学分析。最后，我们将样品中的簇与大量研究的簇进行了比较。研究的系统遵循大多数开放簇描述的化学和运动学趋势。值得注意的是，SI中的三个最贫穷的群集（NGC \，1027，NGC \，1750和Trumpler 2）得到了增强，但在其他所研究的α元素（MG，CA和TI）中却没有增强。
Context: Open clusters are ideal laboratories to investigate a variety of astrophysical topics, from the properties of the Galactic disc to stellar evolution models. For this purpose, we need to know their chemical composition in detail. Unfortunately, the number of systems with chemical abundances determined from high resolution spectroscopy remains small. Aims: Our aim is to increase the number of open clusters with radial velocities and chemical abundances determined from high resolution spectroscopy by sampling a few stars in clusters not studied previously. Methods: We obtained high resolution spectra with the FIES spectrograph at NOT for 41 stars belonging to 20 open clusters. These stars have high astrometric membership probabilities, determined from the Gaia second data release. Results: We derived radial velocities for all the observed stars, which were used to confirm their membership to the corresponding clusters. For Gulliver\,37 we cannot be sure the observed star is a real member. We derived atmospheric parameters for the 32 stars considered real cluster members. We discarded five stars because they have very low gravity or atmospheric parameters were not properly constrained due to low signal-to-noise ratio spectra. Therefore, detailed chemical abundances were determined for 28 stars belonging to 17 clusters. For most of them, this is the first chemical analysis available in the literature. Finally, we compared the clusters in our sample to a large population of well studied clusters. The studied systems follow the trends, both chemical and kinematical, described by the majority of open clusters. Worth noticing that the three most metal-poor studied clusters (NGC\,1027, NGC\,1750 and Trumpler 2) are enhanced in Si but not in the other alpha-elements studied (Mg, Ca and Ti).
