Are neutron-rich elements produced in the collapse of strange dwarfs?

摘要

The structure of strange dwarfs and that of hybrid stars with the same baryonic number is compared. There is a critical mass (M approximate to 0.24M(circle dot)) in the strange dwarf branch, below which configurations with the same baryonic number in the hybrid star branch are more stable. If a transition occurs between both branches, the collapse releases an energy of about of 3 x 10(50) erg, mostly in the form of neutrinos resulting from the conversion of hadronic matter onto strange quark matter. Only a fraction (similar to 4%) is required to expel the outer neutron-rich layers. These events may contribute significantly to the chemical yield of nuclides with A >= 80 in the Galaxy, if their frequency is of about one per 1,500 years.