船帆座X-1脉冲星超巨星伴星风中的X射线光电离泡
X-ray photoionized bubble in the wind of Vela X-1 pulsar supergiant companion
摘要：
船帆座X-1是高质量X射线双星的原型，由一颗中子星和一颗大质量B超巨星组成。这颗超巨星是强烈的辐射驱动恒星风的来源。中子星扫过这些风，并在风吸积过程中释放能量，产生大量的X射线。在这里，我们提供了详细的船帆X-1信封的NLTE模型。我们研究了X射线如何使风加速并破坏负责风加速的离子。辐射力的减小解释了观测到的风的终极速度在朝向中子星的方向上的减小。X射线在中子星周围产生了一个明显的光致电离区域，充满了停滞流。这种光致电离气泡的存在是高质量X射线双星的普遍性质。我们揭示了一个新的原则，管理这些复杂的对象，根据这有一个上限的X射线光度的紧凑型恒星可以没有暂停风，由于低效的线驱动
英文摘要：
Vela X-1 is the archetype of high-mass X-ray binaries, composed of a neutron star and a massive B supergiant. The supergiant is a source of a strong radiatively-driven stellar wind. The neutron star sweeps up this wind, and creates a huge amount of X-rays as a result of energy release during the process of wind accretion. Here we provide detailed NLTE models of the Vela X-1 envelope. We study how the X-rays photoionize the wind and destroy the ions responsible for the wind acceleration. The resulting decrease of the radiative force explains the observed reduction of the wind terminal velocity in a direction to the neutron star. The X-rays create a distinct photoionized region around the neutron star filled with a stagnating flow. The existence of such photoionized bubbles is a general property of high-mass X-ray binaries. We unveiled a new principle governing these complex objects, according to which there is an upper limit to the X-ray luminosity the compact star can have without suspending the wind due to inefficient line driving
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