Open clusters as tracers on radial migration of the galactic disc

Radial migration is an important process in the Galactic disc. A few open clusters show some evidence on this triechanism but there is no systematic study. In this work, we investigate the role of radial migration on the Galactic disc based on a large sample of 146 open clusters with homogeneous metallicity and age from Netopil et al. and kinematics calculated from Gaia DR2. The birth site Rb, guiding radius R,, and other orbital parameters are calculated, and the migration distance iRg - Rh' is obtained, which is a combination of metallicity, kinematics, and age information. It is found that 44 per cent open clusters have IRg < I kpe, for which radial migration (churning) is not significant. Among the remaining 56 per cent open clusters with IRg - Rbl > 1 lino, young ones with t < 1.0 Gyr tend to migrate inward, while older clusters usually migrate outward. Different mechanisnis of radial migration between young and old clusters are suggested based on their different migration rates, Galactic locations, and orbital parameters. For the old group, We propose a plausible way to estimate migratiori rate and obtain a reasonable value of 1.5 0.5 kpc Gyr-1 based on 10 intermediate-age clusters at the outer disc, where the existence of several special clusters implies its complicate formation history.