【摘要】 给出了1992—1995年Be／X射线双星LSI＋61°303每年的光谱观测结果，分析了光谱发射线轮廓及其变化．观测显示Hβ发射线轮廓具有典型的气壳吸收，表明观测视线与Be星赤道平面平行．同时发现Hα发射线参数如等值宽度和双峰强度之比也具有类似射电流量的周期性变化，但其变化与射电流量和光学光度的变化不同，因此认为此变化可能与中子星周围的吸积盘及其轨道交食有关．更多还原

【Abstract】 New optical intermediate dispersion spectra of the periodic radio star LSI+61°303 are presented. The Her emission line shows a typical shell absorptionspectrum, which means that the primary of this Be/X ray binary may be a nearlyequator-on Be star. The Her emission line profile and its variation are analyzed,and some parameters such as the Ha Ed and V/R peak ratio change strongly nearthe radio maximum, and may exhibit periodic variability. Instead of having a widerminimum lasting for about half an orbital cycle as radio flux and V magnitude do,the Her EW shows a deep minimum at phase ～0.75. The accretion disk around theneutron star formed near its periastron passage is suggested to be responsible forthe change when it eclipses the primary and its envelope.更多还原