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arXiv 1502.02663astro-ph.GA
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中子星出生踢和星团的长期生存

Neutron star natal kicks and the long-term survival of star clusters

Filippo Contenta, Anna Lisa Varri, Douglas C. Heggie

摘要:

我们研究了一个星团在外部潮汐场中的动力学演化,通过使用N体模拟,重点是中子星出生速度kicks.We的存在或不存在的影响表明,即使中子星通常代表小于2%的星团的总束缚质量,其原始的运动学性质可能会影响系统的寿命高达近四倍。我们解释这一结果的两个已知的星团溶解模式,无论是早期恒星演化质量损失或两体松弛为主。这些效应之间的竞争塑造了星团的质量损失轮廓,它们可能在核心坍缩前的阶段突然溶解(“跳跃”),也可能在核心坍缩后逐渐溶解(“滑雪”)。

英文摘要:

We investigate the dynamical evolution of a star cluster in an external tidal field by using N-body simulations, with focus on the effects of the presence or absence of neutron star natal velocity kicks.We show that, even if neutron stars typically represent less than 2% of the total bound mass of a star cluster, their primordial kinematic properties may affect the lifetime of the system by up to almost a factor of four. We interpret this result in the light of two known modes of star cluster dissolution, dominated by either early stellar evolution mass loss or two-body relaxation. The competition between these effects shapes the mass loss profile of star clusters, which may either dissolve abruptly ("jumping"), in the pre-core-collapse phase, or gradually ("skiing"), after having reached core collapse.

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