标题： X射线辐射轨道轮廓的可变性在伽马射线双星LS I +61 303中 显示英文标题

标题： Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303

摘要： 我们报告了对 Rossi X-ray Timing Explorer (RXTE) 比例计数器阵列 (PCA) 监测观测的分析，该观测针对$\gamma$射线双星系统 LS I +61 303，涵盖了其轨道运动的35个完整周期。这构成了迄今为止对该源分析的最大连续X射线监测数据集。这种扩展的分析使我们能够报告：a）发现X射线辐射轨道轮廓的变化性，b）在该源典型的总体行为之上存在几个（最近的）短时爆发，这些爆发可能与LS I +61 303有关，也可能无关，这取决于PCA的视场，c）仅使用软X射线数据确定轨道周期性。 显示英文摘要

摘要： We report on the analysis of Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring observations of the $\gamma$-ray binary system LS I +61 303, covering 35 full cycles of its orbital motion. This constitutes the largest continuous X-ray monitoring dataset analyzed to date for this source. Such an extended analysis allows us to report: a) the discovery of variability in the orbital profiles of the X- ray emission, b) the existence of a few (recent) short flares on top of the overall behavior typical of the source, which, given the PCA field-of-view, may or may not be associated with LS I +61 303, and c) the determination of the orbital periodicity using soft X-ray data alone.