Young nearby moving groups are important and useful in many fields of astronomy such as studying exoplanets , low-mass stars , and the stellar evolution of the early planetary systems over tens of millions of years , which has led to intensive searches for their members .
Identification of members depends on the used models sensitively , therefore , careful examination of the models is required .
In this study , we investigate the effects of the models used in moving group membership calculations based on a Bayesian framework ( e.g. , BANYAN II ) focusing on the beta-Pictoris moving group ( BPMG ) .
Three improvements for building models are suggested : ( 1 ) updating a list of accepted members by re-assessing memberships in terms of position , motion , and age , ( 2 ) investigating member distribution functions in XYZ , and ( 3 ) exploring field star distribution functions in XYZ and UVW .
The effect of each change is investigated , and we suggest using all of these improvements simultaneously in future membership probability calculations .
Using this improved MG membership calculation and the careful examination of the age , 57 bona fide members of BPMG are confirmed including 12 new members .
We additionally suggest 17 highly probable members .