... dot-dash)

The figures show only the evolution of the thin disk component of these systems. Even for the closed standard model, after about 1 Gyr, all halo star formation has ceased, that in the thick disk is substantially reduced, and the thin disk is the only active zone of the galaxy and traces the star formation.

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... system)

It also appears possible that the recently studied double red giant branch in $\omega$ Cen may be the result of such environmental action and further hints that this cluster may be the remnant of a dwarf galaxy (e.g. Sollima et al. 2005), but at this point we do not want to claim too much for our models.

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