Gaia DR1 open cluster members University of Antwerp
Katrien Kolenberg, F. van Leeuwen, et al., A. Vallenari, C. Jordi, L. Lindegren, U. Bastian, T. Prusti, J.H.J. de Bruijne, A.G.A. Brown, C. Babusiaux
The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are calculated using Hipparcos and Tycho-2 positions in 1991.25 as prior information. We investigate the scientific potential and limitations of the TGAS component by means of the astrometric data for open clusters. Mean cluster parallax and proper motion values are derived taking into account the error correlations within the astrometric solutions for individual stars, an estimate of the ...