论文标题
使用Gaia Dr2的恒星恒星场中银河开放簇的发现和天体物理特性
Discovery and astrophysical properties of Galactic open clusters in dense stellar fields using Gaia DR2
论文作者
论文摘要
我们报告发现25个新的开放式群集，这是由密集的低银河纬度场进行的搜索而产生的。我们还首次为新发现提供了结构和天体物理参数，并使用Gaia DR2数据提供了34个最近发现的开放式群集。通过共同检查矢量点图和空间分布来确认候选人。通过匹配已知对象并将其平均星形参数与可用文献进行比较，通过匹配其平均天体参数来验证这些发现。将净化算法应用于三维星体空间，以获取簇恒星的成员可能性。通过拒绝较低会员可能性的恒星，我们建立了污染的颜色象征图，并通过等速线拟合得出了簇的天体物理参数。结构参数也通过恒星分布上的国王核配件得出。研究的簇主要位于距太阳3 kpc之内，年龄从30 myr到3.2 Gyr不等，红色限制为E（B-V）= 2.5。平均而言，我们的簇样品比Gaia DR2确认的簇显示的浓缩结构较少，因为衍生的核心半径较大，而潮汐半径没有显着差异。它们中的大多数位于较低纬度的银河盘的静脉象限中，因此它们沉浸在内部银河系的密集田地中。
We report the discovery of 25 new open clusters resulting from a search in dense low galactic latitude fields. We also provide, for the first time, structural and astrophysical parameters for the new findings and 34 other recently discovered open clusters using Gaia DR2 data. The candidates were confirmed by jointly inspecting the vector point diagrams and spatial distribution. The discoveries were validated by matching near known objects and comparing their mean astrometric parameters with the available literature. A decontamination algorithm was applied to the three-dimensional astrometric space to derive membership likelihoods for clusters stars. By rejecting stars with low membership likelihoods, we built decontaminated colour-magnitude diagrams and derived the clusters astrophysical parameters by isochrone fitting. The structural parameters were also derived by King-profile fittings over the stellar distributions. The investigated clusters are mainly located within 3 kpc from the Sun, with ages ranging from 30 Myr to 3.2 Gyr and reddening limited to E(B-V)=2.5. On average, our cluster sample presents less concentrated structures than Gaia DR2 confirmed clusters, since the derived core radii are larger while the tidal radii are not significantly different. Most of them are located in the IV quadrant of the Galactic disc at low latitudes, therefore they are immersed in dense fields characteristic of the inner Milky Way.
