超紧凑X射线双星4U 0614+091中O VIII Lyalpha线的相对论展宽
A relativistically broadened O VIII Lyalpha line in the ultra-compact X-ray binary 4U 0614+091
摘要：
超紧凑的X射线双星由一颗中子星或黑洞组成，它从一颗白矮星-施主星上吸积了物质。超紧凑的性质表现在轨道周期非常短，不到1小时。在4U 0614+091的情况下，来自CO或ONE白矮星的富氧物质流向中子星。这个富含氧的圆盘可以反射中子星发出的X射线，给出一个特征性的发射光谱。本文分析了XMM-Newton卫星获得的4U 0614+091的高分辨率RGS谱和宽谱EPIC谱。我们检测到一个广泛的发射功能，在这两个仪器，这不能解释不寻常的丰度的氧和氖的视线，在文献中提出的。我们解释这一特征为O VIII Lyalpha发射所造成的反射的X射线的高度电离的氧，在强引力场接近中子星。
英文摘要：
Ultra-compact X-ray binaries consist of a neutron star or black hole that accretes material from a white dwarf-donor star. The ultra-compact nature is expressed in very short orbital periods of less than 1 hour. In the case of 4U 0614+091 oxygen-rich material from a CO or ONe white dwarf is flowing to the neutron star. This oxygen-rich disc can reflect X-rays emitted by the neutron star giving a characteristic emission spectrum. We have analyzed high-resolution RGS and broad band EPIC spectra of 4U 0614+091 obtained by the XMM-Newton satellite. We detect a broad emission feature at ~0.7 keV in both instruments, which cannot be explained by unusual abundances of oxygen and neon in the line of sight, as proposed before in the literature. We interpret this feature as O VIII Lyalpha emission caused by reflection of X-rays off highly ionized oxygen, in the strong gravitational field close to the neutron star.
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