2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4148We compute and present the distribution in mass of single and binary neutron stars, strange stars, and black holes. The calculations were performed using a stellar population synthesis code. We follow evolution of massive single stars as well as binaries with high mass primaries. The final product of the latter evolution can be either a binary composed of a white dwarf and a compact object (neutron star, black hole, strange star), two compact objects in a binary, or two single stars if the system was disrupted. We find in binaries a population of black holes which are more massive than single black holes which are a product of either binary or single evolution. We also find that if quark stars exist at all, their population can be as large as the population of black holes.11 pages, 2 figures, ApJ Letter, Vol. 567, in press (March 1, 2002 issue) (results of different calculations presented as compared to The 4th Integral Workshop proceedings: astro-ph/0011183)Astrophysicstext