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arXiv 1504.01202astro-ph.HEastro-ph.SR
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非常大的星族III恒星能产生超级双星吗?

Can very massive Population III stars produce a super-collapsar?

Sung-Chul Yoon, Jisu Kang, Alexandra Kozyreva

摘要:

早期宇宙中第一代恒星的一小部分可能非常大($\gtrsim 300~\mathrm{M_\odot}$),因为它们形成于无金属的环境中。这些恒星的黑洞形成可能伴随着超大质量的伽玛射线暴,产生一种独特类型的长伽玛射线暴,具有非常高的总能量($\sim 10^{54}~\mathrm{erg}$),正如最近几位作者所提出的那样。我们提出了新的恒星演化模型的非常大的人口III恒星,包括旋转的影响,提供理论上的超恒星的祖先。我们发现,角动量条件的超磁星可以满足,如果磁转矩被忽略,在这种情况下,Eddington-Sweet环流起主导作用的角动量的运输。我们进一步发现,超类星体祖先的初始质量范围将限于$300~\mathrm{M_\odot} \lesssim M \lesssim 700~\mathrm{M_\odot}$。然而,我们所有这个质量范围的超大质量恒星模型都以红超巨星而不是蓝超巨星的形式结束了它们的生命,这与以前的大多数研究结果非常一致。这些恒星的预测最终命运要么是一个喷气动力型IIP超新星,要么是一个超长的,相对微弱的伽马射线瞬变,这取决于初始角动量的大小。

英文摘要:

A fraction of the first generation of stars in the early Universe may be very massive ($\gtrsim 300~\mathrm{M_\odot}$) as they form in metal-free environments. Formation of black holes from these stars can be accompanied by supermassive collapsars to produce long gamma-ray bursts of a unique type having a very high total energy ($\sim 10^{54}~\mathrm{erg}$) as recently suggested by several authors. We present new stellar evolution models of very massive Population III stars including the effect of rotation to provide theoretical constraints on super-collapsar progenitors. We find that the angular momentum condition for super-collapsar can be fulfilled if magnetic torques are ignored, in which case Eddington-Sweet circulations play the dominant role for the transport of angular momentum. We further find that the initial mass range for super-collapsar progenitors would be limited to $300~\mathrm{M_\odot} \lesssim M \lesssim 700~\mathrm{M_\odot}$. However, all of our very massive star models of this mass range end their lives as red supergiants rather than blue supergiants, in good agreement with most of the previous studies. The predicted final fate of these stars is either a jet-powered type IIP supernova or an ultra-long, relatively faint gamma-ray transient, depending on the initial amount of angular momentum.

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