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arXiv 2201.04074astro-ph.HE
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武仙座X-1 35天位相轨道光变曲线的演化

The Evolution of the Orbital Light-curve of Hercules X-1 with 35-day Phase

Yuyang Wang, Denis Leahy

摘要:

Hercules X-1/HZ Hercules(Her X-1/HZ Her)是一颗X射线双星,自上世纪以来一直受到多个X射线任务的监测。通过大量的长期观测,我们给出了Her X-1/HZ Her在35天周期的6个态的多个能带的轨道光变曲线。这些图详细地说明了围绕着中子星旋转的扭曲倾斜吸积盘所引起的光变曲线的变化。以0.0535天的相位间隔分析了主高态的轨道光变曲线。这些显示了食前下降的规律性发生,随着35天相位的增加,这些下降会进入更早的轨道相位。从多波段光变曲线,我们推导出光电吸收和能量无关传输的柱密度的时间平均轨道相位依赖性作为35天相位的函数。在低态期间的X射线光变曲线在形状上类似于光学低态光变曲线,但是X射线在轨道相位上领先光学$\simeq$ 0.04到0.08。

英文摘要:

Hercules X-1/HZ Hercules (Her X-1/HZ Her) is an X-ray binary monitored by multiple X-ray missions since last century. With the abundance of long-term observations, we present a complete set of orbital light-curves of Her X-1/HZ Her during the six states of the 35-day cycle in multiple energy bands. These illustrate in detail the changing light-curve caused by the rotating twisted-tilted accretion disc surrounding the neutron star. The orbital light-curves during Main-High (MH) state are analyzed in 0.05 35-day phase intervals. These show the regular occurrence of pre-eclipse dips which march to earlier orbital phase as 35-day phase increase. From the multi-band light-curves we derive time-average orbital phase dependence of column density for photoelectric absorption and energy-independent transmission as a function of 35-day phase. The X-ray light-curves during Low States are similar in shape to the optical Low State light-curve, but X-ray leads optical by $\simeq$0.04 to 0.08 in orbital phase.

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