Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-13
Massive Stars in Interactive Binaries, ASP Conference Series 367, Astronomical Society of the Pacific, 2007., p.707
Astronomy and Astrophysics
Astrophysics
6 pages, 5 figures, Invited talk at "Massive Stars in Interacting Binaries" (Lac Sacacomie, Quebec, 16-20 Aug 2004)
Scientific paper
Using Monte Carlo codes, we follow the collisional evolution of clusters in a variety of scenarios. We consider the conditions under which a cluster of main sequence stars may undergo rapid core collapse due to mass segregation, thus entering a phase of runaway collisions, forming a very massive star (VMS, M >= 1000 Msun) through repeated collisions between single stars. Although collisional mass loss is accounted for realistically, we find that a VMS forms even in proto-galactic nuclei models with a high velocity dispersion (many 100 km/s). Such a VMS may be a progenitor for an intermediate-mass black hole (M >= 100 Msun). In contrast, in galactic nuclei hosting a central massive black hole, collisions are found to be disruptive. The stars which are subject to collisions are progressively ground down by high-velocity collisions and a merger sequence appears impossible.
Freitag Marc
Gürkan Mehmet Atakan
Rasio Frederic A.
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