Can very massive stars avoid Pair-Instability Supernovae?

Details Can very massive stars avoid Pair-Instability Supernovae? Can very massive stars avoid Pair-Instability Supernovae?

2008-01-22

arxiv.org/abs/0801.3397v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, proceedings of the IAU Symposium 250 "Massive stars as cosmic engines"

Scientific paper

10.1017/S1743921308020516

Very massive primordial stars (140 Msol < M < 260 Msol) are supposed to end their lives as PISN. Such an event can be traced by a typical chemical signature in low metallicity stars, but at the present time, this signature is lacking in the extremely metal-poor stars we are able to observe. Does it mean that those very massive objects were not formed, contrarily to the primordial star formation scenarios ? Could it be possible that they avoided this tragical fate ? We explore the effects of rotation, anisotropical mass loss and magnetic field on the core size of very massive Population III models. We find that magnetic fields provide the strong coupling that is lacking in standard evolution metal-free models and our 150 Msol Population III model avoids indeed the pair-instability explosion.

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