Griggio, M.M.GriggioBEDIN, LuigiLuigiBEDIN2023-01-232023-01-2320220035-8711http://hdl.handle.net/20.500.12386/32989In this work, starting from the well-accepted relations in literature, we introduce a new formalism to compute the astrometric membership probabilities for sources in star clusters, and we provide an application to the case of the open cluster M 37. The novelty of our approach is a refined - and magnitude-dependent - modelling of the parallax distribution of the field stars. We employ the here-derived list of members to estimate the cluster's mean systemic astrometric parameters, which are based on the most recent Gaia's catalogue (EDR3).STAMPAenArticle10.1093/mnras/stac3912-s2.0-85126453929https://academic.oup.com/mnras/article/511/4/4702/6534275http://arxiv.org/abs/2202.07942v22022MNRAS.511.4702GFIS/05 - ASTRONOMIA E ASTROFISICA