标题： 1E 2259+586 的自转减慢率来自RXTE观测 显示英文标题

标题： Spin-down rate of 1E 2259+586 from RXTE observation

摘要： 我们提供了1997年3月使用Rossi X射线时变探测器（RXTE）获得的X射线脉冲星1E 2259+586的新X射线观测结果。 我们从持续一个月的5次观测中获得的脉冲到达时间测量得到了脉冲频率导数$\dot \nu = (-1.08 \pm 0.04) \times 10^{-14}$ Hz s$^{-1}$。 此$\dot\nu$与长期自转下降趋势一致。 我们还发现，观测到的X射线光度与之前任务在静默X射线流量水平下测量的结果一致。 我们的观测表明，在我们的观测所覆盖的一个月内，1E 2259+586稳定地自转下降，没有表现出任何随机扭矩噪声波动。 显示英文摘要

摘要： We present new X-ray observations of the X-ray pulsar 1E 2259+586, obtained during March 1997, with the Rossi X-Ray Timing Explorer (RXTE). We have measured the pulse frequency derivative $\dot \nu = (-1.08 \pm 0.04) \times 10^{-14}$ Hz s$^{-1}$ from pulse arrival times obtained in a sequence of 5 observations spread over one month. This $\dot\nu$ is consistent with the long term spin-down trend. We also found that the observed X-ray luminosity is consistent with that measured at quiescent X-ray flux levels by previous missions. Our observations imply that 1E 2259+586 was spinning down steadily without exhibiting any stochastic torque noise fluctuations during the month covered by our observations.