Low-mass members of nearby young stellar moving groups from Gaia EDR3
  Gaia EDR3 offers greatly improved kinematics for nearby objects, including
members of nearby young stellar moving groups (NYMGs). In this study, we aim to
identify low-mass NYMG members (spectral types of M0 to mid-L) in Gaia EDR3. We
calculated spatio-kinematic membership probabilities utilising a Bayesian
membership probability calculation scheme developed in our previous study. We
evaluated stellar youth primarily based on colour-magnitude diagram positions.
Combining spatio-kinematic membership assessment and youth evaluation, we
identified ~2900 low-mass NYMG candidate members including ~700 previously
claimed members. In the set of ~2200 new candidate members, ~550 appear to be
young based on NUV brightness. Our pilot spectroscopic study with WiFeS on the
ANU 2.3-m telescope observed 78 candidates, with 79 per cent confirmed as
members. Using our new member sample, we estimated an isochronal age of the
beta-Pictoris Moving Group. The mean age (~10 Myr), which is around half the
age of recent estimates, suggests either a truly younger age of the
beta-Pictoris Moving Group or inaccuracies in contemporary isochrones. As the
main results of this study, we provide lists of newly confirmed and candidate
low-mass NYMG members.
