标题： RXTE 全天监测器观测到的 2S0114+650 中非常缓慢的X射线脉冲星的证据 显示英文标题

标题： Evidence for a very slow X-ray pulsar in 2S0114+650 from RXTE All-Sky Monitor Observations

摘要： 罗西X射线时变探测器（RXTE）全天监视器（ASM）对X射线双星2S0114+650的观测显示了接近光学推导出的轨道周期（11.591天）和建议的脉冲周期（~2.7小时）的调制现象。在超过两年的ASM观测中，脉冲周期显示出频率和强度的变化。脉冲特性与吸积到旋转中子星上的情况一致，这将是已知最慢的此类周期。 轨道光变曲线的形状在整个轨道期间显示出调制，并且将其与Vela X-1的轨道光变曲线进行了比较。然而，基于光学历表外推的预期掩食相位并不对应于观测到的轨道最小值。 从ASM光变曲线得出的轨道周期也略长于光学周期。 显示英文摘要

摘要： Rossi X-ray Timing Explorer (RXTE) All-Sky Monitor (ASM) observations of the X-ray binary 2S0114+650 show modulations at periods close to both the optically derived orbital period (11.591 days) and proposed pulse period (~ 2.7 hr). The pulse period shows frequency and intensity variability during the more than 2 years of ASM observations analyzed. The pulse properties are consistent with this arising from accretion onto a rotating neutron star and this would be the slowest such period known. The shape of the orbital light curve shows modulation over the course of the entire orbit and a comparison is made with the orbital light curve of Vela X-1. However, the expected phase of eclipse, based on an extrapolation of the optical ephemeris, does not correspond with the observed orbital minimum. The orbital period derived from the ASM light curve is also slightly longer than the optical period.