Formation of the white-dwarf population of the Galactic halo

Microlensing events detected in the MACHO project are sometimes interpreted as evidence for the presence of a rich population of white dwarfs in the halo of the Galaxy, containing up to 10¹² objects. In this connection, we study the possible formation of this population in the Galaxy via the accretion of gaseous or gaseous-stellar systems. The accumulation of a large number of white dwarfs in the Galactic halo is possible only if several specific conditions are simultaneously satisfied. We conclude that the presence of a rich white-dwarf population in the halo is unlikely.