Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-29
Astrophys.J. 615 (2004) L65-L68
Astronomy and Astrophysics
Astrophysics
Astrophysical Journal Letter, in press. 10 pages, 2 color figures, (full paper with high-resolution figures available at htt
Scientific paper
10.1086/426389
We explore the possibility for the formation of Population III binaries. The collapse of a rotating cylinder is simulated with a three-dimensional, high-resolution nested grid, assuming the thermal history of primordial gas. The simulations are done with dimensionless units, and the results are applicable to low-mass as well as massive systems by scaling with the initial density. We find that if the initial angular momentum is as small as $\beta \approx 0.1$, where $\beta$ is the ratio of centrifugal force to pressure force, then the runaway collapse of the cloud stops to form a rotationally-supported disk. After the accretion of the envelope, the disk undergoes a ring instability, eventually fragmenting into a binary. If the initial angular momentum is relatively large, a bar-type instability arises, resulting in the collapse into a single star through rapid angular momentum transfer. The present results show that a significant fraction of Pop III stars are expected to form in binary systems, even if they are quite massive or less massive. The cosmological implications of Population III binaries are briefly discussed.
Matsumoto Tomoaki
Saigo Kazuya
Umemura Masayuki
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