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Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2020-09-28 , DOI: 10.1093/mnras/staa2983
H Monteiro 1 , W S Dias 1 , A Moitinho 2 , T Cantat-Gaudin 3 , J R D Lépine 4 , G Carraro 5 , E Paunzen 6
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Reliable fundamental parameters of open clusters such as distance, age and extinction are key to our understanding of Galactic structure and stellar evolution. In this work we use {\it Gaia} DR2 to investigate 45 open clusters listed in the \emph{New catalogue of optically visible open clusters and candidates} (DAML) but with no previous astrometric membership estimation based on {\it Gaia} DR2. In the process of selecting targets for this study we found that some clusters reported as new discoveries in recent papers based on {\it Gaia} DR2 were already known clusters listed in DAML. Cluster memberships were determined using a maximum likelihood method applied to {\it Gaia} DR2 astrometry. This has allowed us to estimate mean proper motions and mean parallaxes for all investigated clusters. Mean radial velocities were also determined for 12 clusters, 7 of which had no previous published values. We have improved our isochrone fitting code to account for interstellar extinction using an updated extinction polynomial for the {\it Gaia} DR2 photometric band-passes and the Galactic abundance gradient as a prior for metallicity. The updated procedure was validated with a sample of clusters with high quality $[Fe/H]$ determinations. We then did a critical review of the literature and verified that our cluster parameter determinations represent a substantial improvement over previous values.

中文翻译:

具有 Gaia DR2 的 45 个疏散星团的基本参数、改进的消光校正和先验的金属丰度梯度

距离、年龄和灭绝等疏散星团的可靠基本参数是我们理解星系结构和恒星演化的关键。在这项工作中,我们使用 {\it Gaia} DR2 来调查 \emph {光学可见疏散星团和候选者的新目录}(DAML)中列出的 45 个疏散星团,但之前没有基于 {\it Gaia} DR2 的天体测量成员估计. 在为这项研究选择目标的过程中,我们发现一些基于 {\it Gaia} DR2 在最近的论文中报告为新发现的集群是 DAML 中列出的已知集群。使用应用于 {\it Gaia} DR2 天体测量的最大似然方法确定集群成员资格。这使我们能够估计所有研究集群的平均自行和平均视差。还确定了 12 个集群的平均径向速度,其中 7 个没有先前公布的值。我们已经改进了我们的等时线拟合代码,以使用更新的 {\it Gaia} DR2 光度带通和银河丰度梯度作为金属丰度的先验的消光多项式来解释星际消光。使用具有高质量 $[Fe/H]$ 测定值的簇样本验证了更新的程序。然后,我们对文献进行了严格审查,并验证了我们的集群参数确定比以前的值有了实质性的改进。我们已经改进了我们的等时线拟合代码,以使用更新的 {\it Gaia} DR2 光度带通和银河丰度梯度作为金属丰度的先验的消光多项式来解释星际消光。使用具有高质量 $[Fe/H]$ 测定值的簇样本验证了更新的程序。然后,我们对文献进行了严格审查,并验证了我们的集群参数确定比以前的值有了实质性的改进。我们已经改进了我们的等时线拟合代码,以使用更新的 {\it Gaia} DR2 光度带通和银河丰度梯度作为金属丰度的先验的消光多项式来解释星际消光。使用具有高质量 $[Fe/H]$ 测定值的簇样本验证了更新的程序。然后,我们对文献进行了严格审查,并验证了我们的集群参数确定比以前的值有了实质性的改进。
更新日期:2020-09-28
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