论文标题
X射线脉冲星Vela X-1的扭矩逆转和风变化
Torque reversals and wind variations of X-ray pulsar Vela X-1
论文作者
论文摘要
Vela X-1的旋转历史不稳定，显示了数十天内连续的旋转/旋转趋势。我们使用Fermi/GBM和Swift/BAT和Maxi/GSC的光曲线监控的自旋历史记录在这些旋转/旋转间隔中研究Vela X-1的轨道曲线和光谱特性。旋转间隔的蝙蝠通量约为旋转间隔间隔的1.6倍。旋转间隔还显示出比旋转间隔更高的色谱柱密度，这表明轨道尺度上有更多的材料以进行旋转间隔。这可能是由于数十天的光星（HD 77581）的恒星风变化。变化的风可能导致交替的进展/逆行流动到中子恒星，这主要主导了角动量向Vela X-1的转移，但观察到的亮度却没有。
The erratic spin history of Vela X-1 shows some continuous spin-up/spin-down trend over tens of days. We study the orbital profile and spectral property of Vela X-1 in these spin-up/spin-down intervals, using the spin history monitored by Fermi/GBM and light curve from Swift/BAT and MAXI/GSC. The BAT fluxes in the spin-up intervals are about 1.6 times those of the spin-down intervals for out-of-eclipse orbital phases. The spin-up intervals also show a higher column density than the spin-down intervals, indicating there are more material on the orbital scale for the spin-up intervals. It could be due to the variation of the stellar wind of the optical star (HD 77581) on tens of days. The varying wind could lead to alternating prograde/retrograde accreting flow to the neutron star, which dominates the transfer of the angular momentum to Vela X-1, but not the total observed luminosity.
