Radio observations of PSR B1259-63 through the 2004 periastron passage
Radio observations of PSR B1259-63 through the 2004 periastron passage
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DOI：
10.1111/j.1365-2966.2005.08854.x
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发表时间：
2005-01
影响因子：
4.8
通讯作者：
S. Johnston;L. Ball;Na Wang;Na Wang;R. Manchester
中科院分区：
文献类型：
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作者：
S. Johnston;L. Ball;Na Wang;Na Wang;R. Manchester
我们在这里报告了对包含PSR B1259-63和Be星SS 2883的双星系统的广泛射电观测，该双星系统是在2004年近星体前后进行的。这是第四次对近星体进行详细观测。与以前的观测一样，脉冲星的色散和自转测量的变化是在200d的周期内探测到的。我们表明，脉冲发射的日食从近星体之前的16d持续到近星体之后的15d，并且从一个周星体到下一个周星体是一致的。我们证明了Wang，Johnston和曼彻斯特提出的时序解决方案通过2004年的近地点星体提供了很好的匹配。瞬变非脉冲射电发射的光曲线从一个近星体到另一个近星体大致相似。然而，对于这个近星体，光曲线是在近星体后强烈尖化的，在近星体之前有相当小的增强，与2000年的近星体相比，那里的峰值通量密度更相等。这些观测仍然与脉冲星穿过Be星致密的星周圆盘的解释一致，就在近星体之前和之后。观测到的近星体之间的差异可以归因于脉冲星进入星盘时局部盘密度和磁场结构的变化。
We report here on extensive radio observations of the binary system containing PSR B1259-63 and the Be star SS 2883, made around the time of the 2004 periastron. This is the fourth periastron to have been observed in detail. As in previous observations, changes in the dispersion and rotation measures of the pulsar are detected over a period spanning 200 d. We show that the eclipse of the pulsed emission lasts from 16 d prior to periastron to 15 d after periastron and is consistent from one periastron to the next. We demonstrate that the timing solution proposed by Wang, Johnston & Manchester provides a good fit through the 2004 periastron. The light curve of the transient unpulsed radio emission is broadly similar from one periastron to the next. For this periastron, however, the light curve is strongly peaked post-periastron with rather little enhancement prior to periastron, in contrast to the 2000 periastron where the peak flux densities were more equal. These observations remain consistent with the interpretation that the pulsar passes through the dense circumstellar disc of the Be star just before and just after periastron. The observed differences from one periastron to the next can be ascribed to variations in the local disc density and magnetic field structure at the time the pulsar enters the disc.