Because of their massive and dense cores, globular clusters are prime candidates for containing many binary stars. In 1991, Manchester et al. reported the discovery of 10 millisecond pulsars in the globular cluster 47 Tuc (also known as Messier 91). It is thought that these millisecond pulsars in GC's form when a while dwarf collapses under its own weight after it accretes material from a companion and exceeds the Chandrasekhar limit.Suggested reading:
Manchester, R.N., Lyne, A.G., Robinson, C., D'Amico, N.D., Bailes, M. and Lim, J. 1991, Nature 352, 219.
Cheng, K. and Ruderman, M. 1993, Astrophys. J. 408, 179.
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