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从三重系统的动态展开中形成最宽的双星
1Institute for Astronomy, University of Hawaii at Manoa, 640 North Aohoku Place, Hawaii 96720, USA. reipurth@ifa.hawaii.edu
Nature
|December 11, 2012
概括
超宽的双星,挑战恒星形成理论,可以从紧的三重系统中形成. 数百万年来的动态散射可以抛出一颗恒星,形成模仿双星的广泛分离.
科学领域:
- 天文学和天体物理学
- 恒星动力学 恒星动力学
- 星星形成的形成
背景情况:
- 非常宽的双星系统挑战了目前的恒星形成理论,因为分离超过了典型的云核大小.
- 对于超宽双星的现有假设包括恒星团溶解和引力捕获.
- 最近的观测将非常宽的二进制星与三重系统联系起来,接近的二进制星经常有遥远的第三个伴侣.
研究的目的:
- 调查新生三重系统在新生云核中的动态进化.
- 为了解释在天文调查中观察到的非常宽的二进制星系的形成.
- 将恒星形成的理论模型与广泛的二进制和三进制星系的观测数据相协调.
主要方法:
- 使用N体模拟来建模年轻三星系统的动态演变.
- 模拟追踪了这些系统从它们在云核中的初始紧状态.
- 在数百万年的时间尺度上分析了进化,以观察长期的动态效应.
主要成果:
- 模拟显示,紧的三重系统可以演变为极端的等级体系结构.
- 动态散射可以将一个组成恒星抛出到非常遥远的轨道上.
- 喷射的能量来自其他两个恒星的收缩轨道,使它们看起来像一个单一的恒星.
结论:
- 松散的三重系统可以动态演变,以显现为非常宽的二进制系统.
- 这种机制为观察到的超宽二进制星系的形成提供了可行的解释.
- 这些发现表明动态进化在塑造恒星系统架构方面发挥着重要作用.
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