Abstract
Some results of searches for microlensing events indicate that the Galaxy possesses a massive halo made up of white dwarfs. We show that the possibility for such a halo to exist is essentially constrained not only by the chemical composition of the Galaxy, but also (and mainly) by its structure. In a number of cases, due to the variation of the initial mass function towards an increase in the relative fraction of stars that evolve into white dwarfs with time, their actual number in the halo decreases. We conclude that, in a description of the Galaxy as a single system, the existence of numerous white dwarfs in the halo is unlikely.
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