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arXiv 0909.1959astro-ph.GAastro-ph.CO
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银河系中心双星的潮汐破裂及其后果

Tidal break-up of binary stars at the Galactic center and its consequences

Fabio Antonini, Joshua Faber, Alessia Gualandris, David Merritt

摘要:

星系中心的超大质量黑洞(SMBH)对双星系统的潮汐分裂被认为是星系晕中观测到的超高速星(HVS)样本和围绕Sgr A* 保持在紧密轨道上的S星的来源。在这里,我们使用后牛顿N体代码来研究高椭圆约束轨道上的主序星双星的动力学,其近点位于SMBH附近,确定弹射和约束恒星以及碰撞产物的性质。与以往的研究不同,我们遵循的二进制文件,保持约束周围的SMBH几个革命,发现在相对较大的近拱点和高度倾斜的二进制文件的情况下,Kozai共振可能会导致大的周期性振荡的内部二进制偏心率和倾角。碰撞和合并的二进制元素被发现显着增加的多个轨道周围的SMBH,而HVS主要是在一个二进制的第一次通过期间产生。这个过程可能导致恒星合并,并最终成为银河系中心年轻恒星的重要来源。

英文摘要:

The tidal breakup of binary star systems by the supermassive black hole (SMBH) in the center of the galaxy has been suggested as the source of both the observed sample of hypervelocity stars (HVSs) in the halo of the Galaxy and the S-stars that remain in tight orbits around Sgr A*. Here, we use a post-Newtonian N-body code to study the dynamics of main-sequence binaries on highly elliptical bound orbits whose periapses lie close to the SMBH, determining the properties of ejected and bound stars as well as collision products. Unlike previous studies, we follow binaries that remain bound for several revolutions around the SMBH, finding that in the case of relatively large periapses and highly inclined binaries the Kozai resonance can lead to large periodic oscillations in the internal binary eccentricity and inclination. Collisions and mergers of the binary elements are found to increase significantly for multiple orbits around the SMBH, while HVSs are primarily produced during a binary's first passage. This process can lead to stellar coalescence and eventually serve as an important source of young stars at the galactic center.

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