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| Paper: |
Core oscillations in globular cluster evolution - Recent results |
| Volume: |
13, The Formation and Evolution of Star Clusters |
| Page: |
381 |
| Authors: |
Cohn, H. N.; Lugger, P. M.; Grabhorn, R. P.; Breeden, J. L.; Packard, N. H.; Murphy, B. W.; Hut, P. |
| Abstract: |
We review recent results from studies of globular cluster dynamical evolution following core collapse that consider energy input from hard binary stars. A number of evolutionary simulations have indicated that binaries drive an unstable core reexpansion, resulting in large amplitude oscillations of the core radius and central density. Core oscillations are found to occur for all binary formation mechanisms considered: (1) the star formation process itself; (2) three-body interactions; and (3) two-body tidal capture. We summarize two recent studies of core oscillations. The first analyzed oscillations from the perspective of chaos theory, supporting their interpretation as unstable global modes of a cluster. The second investigated oscillations in a cluster containing a stellar mass spectrum, finding that oscillations persist when there are a sufficient number of massive nonluminous remnants. |
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