A Multi-Membership Catalogue for 1876 Open Clusters using UCAC4 data

The main objective of this work is to determine the cluster members of 1876 open clusters, using positions and proper motions of the astrometric fourth United States Naval Observatory (USNO) CCD Astrograph Catalog (UCAC4). For this purpose, we apply three different methods, all based on aBayesian approach, butwith different formulations: a purely parametric method, another completely non-parametric algorithm and a third, recently developed by Sampedro & Alfaro, using both formulations at different steps of the whole process. The first and second statistical moments of the members' phase-space subspace, obtained after applying the three methods, are compared for every cluster. Although, on average, the three methods yield similar results, there are also specific differences between them, as well as for some particular clusters. The comparison with other published catalogues shows good agreement. We have also estimated, for the first time, the mean proper motion for a sample of 18 clusters. The results are organized in a single catalogue formed by two main files, one with the most relevant information for each cluster, partially including that in UCAC4, and the other showing the individual membership probabilities for each star in the cluster area. The final catalogue, with an interface design that enables an easy interaction with the user, is available in electronic format at the Stellar Systems Group (SSG-IAA).© 2017 The Authors.
We acknowledge financial support from the Spanish Ministry for Economy and Competitiveness and FEDER funds through grants AYA-2010-17631, BES-2011-049077, AYA-2013-40611-P and AYA016-75931-C2-1-P. LS acknowledges financial support from the Brazilian funding agency FAPESP (postdoc fellowship process number 2016/21664-2). AM acknowledges financial support from the Brazilian funding agency FAPESP (postdoc fellowship process number 2014/11806-9).