在二元毫秒脉冲星中,旋转和积累功率之间的波动在二元毫秒脉冲星中发生波动
A Papitto1, C Ferrigno, E Bozzo
1Institute of Space Sciences (ICE; IEEC-CSIC), Campus UAB, Faculty of Science, Torre C5, Parell, 2a Planta, E-08193 Barcelona, Spain. papitto@ice.csic.es
Nature
|September 27, 2013
概括
双星系统中的中子星可以在积聚物质和发射X射线之间切换,并通过磁场旋转产生无线电脉冲. 这项研究观察到一个中子星在这两个状态之间进行过渡,证实了它们的进化联系.
科学领域:
- 天体物理学 天体物理学
- 高能天体物理学 高能天体物理学
- 中子星物理学 中子星物理学
背景情况:
- 低质量双星系统中的中子星被认为通过积聚物质和角运动量旋转到千秒周期.
- 积聚阶段的特点是明亮的X射线发射 (低质量X射线二进制星),而后期阶段则以旋转为动力的射电毫秒脉冲星为特征.
研究的目的:
- 为了提供直接的观测证据,证明积累驱动和旋转驱动的毫秒脉冲星之间的过渡.
- 为了研究中子星二进制系统的快速状态切换能力.
主要方法:
- 从之前被确定为旋转驱动无线电脉冲星的中子星观察毫秒X射线脉冲.
- 在X射线爆发后监控无线电脉冲检测.
主要成果:
- 从一个中子星直接检测到由积累驱动的,毫秒的X射线脉冲,这颗中子星以前被观察到是旋转驱动的无线电脉冲星.
- 在一个月的X射线爆发后几天内再次检测到无线电脉冲,表明状态发生了快速变化.
结论:
- 观察到的转变提供了强有力的证据,证明了低质量X射线二进制星和旋转驱动的毫秒脉冲星之间的进化联系.
- 证明一些中子星系统可以在短时间内迅速在增积驱动和旋转驱动状态之间切换.
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