Determinação da massa de aglomerados abertos utilizando dados do catálogo EDR3

Abstract

With the publication of the Gaia catalogue, and with the existence of automated isochrone fitting methods, the study of open clusters has undergone major advances in recent years. Its fundamental parameters have been, consequently, getting estimated in a larger scale and with better precision. However, important parameters such as the total masses of these objects, the details about populations of individual stars and of binary stars, and the existence of mass segregation are not adequately studied. Within this context, in this work we introduce a new method to determinate individual masses, including of binary stars. This method allows us to study the total mass of open clusters, as well as to study details of binary populations through their mass functions. To validate the method and its efficiency, we used synthetic clusters with predetermined parameters. With the validated method, we applied the procedure to clusters from a recent catalogue of fundamental parameters by our group, obtained from GAIA Early Data Release 3 (EDR 3). The main results include the obtaining of the detailed mass function for the populations of individual, primary, and secondary stars, in addition to the total masses for 895 clusters. We also show the relation between the total masses and other fundamental parameters, discussing its dynamic implications.