Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-04-06
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
23 pages, 24 figures, Submitted to MNRAS
Scientific paper
The onset of runaway stellar collisions in young star clusters is more likely to initiate with an encounter between a binary and a third star than between two single stars. Using the initial conditions of such three-star encounters from direct $N$-body simulations, we model the resulting interaction by means of Smoothed Particle Hydrodynamics (SPH). We find that, in the majority of the cases considered, all three stars merge together, and in such three star mergers, the hydrodynamic simulations reveal that: (1) mass lost as ejecta can be a considerable fraction of the total mass in the system (up to $\sim25$%); (2) due to asymmetric mass loss, the collision product can sometimes receive a kick velocity that exceeds 10 km/s, large enough to allow the collision product to escape the core of the cluster; and (3) the energy of the ejected matter can be large enough (up to $\sim 3\times 10^{50}$ erg) to remove or disturb the inter cluster gas appreciably.
Gaburov Evghenii
Lombardi Jr. J.
Portegies Zwart Simon
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