Evidence of Early-stage Tidal Structures of Open Clusters Revealed by Kinematics with Gaia EDR3

Abstract Blanco 1, a 100 Myr open cluster in the solar neighborhood, is well known for its two 50 pc long tidal tails. Taking 1 as reference, we find evidence of early-stage disruption other clusters ∼120 Myr: Pleiades and NGC 2516, via Gaia EDR3 data. These have total mass 2–6 times that 1. Despite having similar age 2516 larger fraction their members bound: 86% inside radius, versus 63% However, correlation between 1's tails “kinematic tails” velocity space also found 2516. This supports idea modest elongation seen spatial distribution result disruption.