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arXiv 1805.03045astro-ph.GA
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发现盖亚疏散星团的新方法:DR2确认的新的邻近疏散星团

A new method for unveiling Open Clusters in Gaia: new nearby Open Clusters confirmed by DR2

A. Castro-Ginard, C. Jordi, X. Luri, F. Julbe, M. Morvan, L. Balaguer-Núñez, T. Cantat-Gaudin

摘要:

盖亚数据发布2(Gaia DR 2)的发布开启了天文学的新时代。它包括超过$1.3$亿个来源的精确天体测量数据(位置、自行和视差),其中大部分是恒星。为了分析如此大量的新数据,必须使用数据挖掘技术和机器学习算法。寻找疏散星团是一个应用这些技术的很好的例子。疏散星团是一组一起诞生和运动的恒星,位于盘状星云中。我们的目标是开发一种方法来自动探索数据空间,需要最少的人工干预。我们探讨了基于密度的聚类算法,DBSCAN,发现集群的数据与监督学习方法,如人工神经网络(ANN),自动区分真正的疏散星团和统计集群的性能。这种方法的发展和实施的$5$ -维空间($l$,$b$,$\varpi$,$μ_{α^*}$,$μ_δ$)的Tycho-Gaia天体测量解决方案(TGAS)的数据,和后验验证使用盖亚DR 2数据,导致一组新的附近的疏散星团的建议。我们已经开发了一种方法来找到天体测量数据中的OC,旨在应用于完整的盖亚DR 2档案。

英文摘要:

The publication of the Gaia Data Release 2 (Gaia DR2) opens a new era in Astronomy. It includes precise astrometric data (positions, proper motions and parallaxes) for more than $1.3$ billion sources, mostly stars. To analyse such a vast amount of new data, the use of data mining techniques and machine learning algorithms are mandatory. The search for Open Clusters, groups of stars that were born and move together, located in the disk, is a great example for the application of these techniques. Our aim is to develop a method to automatically explore the data space, requiring minimal manual intervention. We explore the performance of a density based clustering algorithm, DBSCAN, to find clusters in the data together with a supervised learning method such as an Artificial Neural Network (ANN) to automatically distinguish between real Open Clusters and statistical clusters. The development and implementation of this method to a $5$-Dimensional space ($l$, $b$, $\varpi$, $μ_{α^*}$, $μ_δ$) to the Tycho-Gaia Astrometric Solution (TGAS) data, and a posterior validation using Gaia DR2 data, lead to the proposal of a set of new nearby Open Clusters. We have developed a method to find OCs in astrometric data, designed to be applied to the full Gaia DR2 archive.

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。

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