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arXiv 1307.3258astro-ph.GA
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失控双星LP 400-22正在离开银河系

The Runaway Binary LP 400-22 is Leaving the Galaxy

Mukremin Kilic, A. Gianninas, Warren R. Brown, Hugh C. Harris, Conard C. Dahn, M. A. Agueros, Craig O. Heinke, S. J. Kenyon, J. A. Panei, Fernando Camilo

摘要:

我们目前的光学光谱,天体测量,无线电和X射线观测失控的二进制LP 400-22。我们根据新的径向速度观测结果对系统的轨道参数进行了修正。我们的视差数据表明,LP 400-22比最初预测的要远得多(3 σ下限为840 pc)。LP 400-22的切向速度超过830 km/s;它不受银河系束缚。我们的射电和X射线观测未能探测到一个再循环的毫秒脉冲星伴星,这表明LP 400-22是一个双白矮星系统。这基本上排除了超新星失控喷射机制。根据它的轨道,银河系中心的起源也是不可能的。然而,它的轨道与几个球状星团的位置相交; LP 400-22与其他双星或致密星团中的中央黑洞之间的动力学相互作用可以解释这个不寻常的双星的起源。

英文摘要:

We present optical spectroscopy, astrometry, radio, and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial velocity observations. Our parallax data indicate that LP 400-22 is significantly more distant (3 sigma lower limit of 840 pc) than initially predicted. LP 400-22 has a tangential velocity in excess of 830 km/s; it is unbound to the Galaxy. Our radio and X-ray observations fail to detect a recycled millisecond pulsar companion, indicating that LP 400-22 is a double white dwarf system. This essentially rules out a supernova runaway ejection mechanism. Based on its orbit, a Galactic center origin is also unlikely. However, its orbit intersects the locations of several globular clusters; dynamical interactions between LP 400-22 and other binary stars or a central black hole in a dense cluster could explain the origin of this unusual binary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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