White Dwarf Subsystems in Core-Collapsed Globular Clusters

Numerical and observational evidence suggests that massive white dwarfs dominate the innermost regions of core-collapsed globular clusters by both number total mass. Using NGC 6397 as a test case, we constrain features dwarf populations in clusters, at present day throughout their lifetimes. The dynamics these subsystems have astrophysical implications. We demonstrate collapse cluster cores is ultimately halted dynamical burning binaries. predict local universe yield merger rate $\mathcal{O}(10\rm{)\,Gpc}^{-3}\,\rm{yr}^{-1}$, roughly $0.1-1\%$ observed Type Ia supernova rate. show prior to merger, inspiraling binaries will be observable gravitational wave sources milli- decihertz frequencies. Over $90\%$ mergers mass greater than Chandrasekhar limit. If merger/collision remnants are not destroyed completely an explosive transient, argue may either young neutron stars/pulsars/magnetars (in event accretion-induced collapse) or offset from standard cooling sequence. Finally, collisions between main sequence stars, which detectable bright transients, occur $\mathcal{O}(100\rm{)\,Gpc}^{-3}\,\rm{yr}^{-1}$ universe. find lead depletion blue straggler stars star centers clusters.