The semicentennial binary system PSR J2032+4127 at periastron: X-ray photometry, optical spectroscopy and SPH modelling.
The semicentennial binary system PSR J2032+4127 at periastron: X-ray photometry, optical spectroscopy and SPH modelling.
复制标题
DOI：
10.1093/mnras/stz515
复制
发表时间：
2019-02
影响因子：
4.8
通讯作者：
M. Coe;A. Okazaki;I. Steele;C. Ng;W. Ho;A. Lyne;B. Stappers;T. Johnson;P. Ray;M. Kerr
中科院分区：
文献类型：
--
作者：
M. Coe;A. Okazaki;I. Steele;C. Ng;W. Ho;A. Lyne;B. Stappers;T. Johnson;P. Ray;M. Kerr
给出了2017年11月高度偏心的、~50年双星系统PSR J2032+4127的近地星子通道的X射线光度和光谱。该系统由一颗绕大质量OB星运行的143毫秒脉冲星组成，MT 91-213。数据显示，在遭遇期间，随着脉冲星风与恒星风的碰撞，发生了戏剧性的变化。X射线通量在接近近星体时上升，然后在近星体附近的几天内经历了一个较大的下降，然后在接下来的几周里逐渐下降。光谱分析表明，H？接近近星点的线条强度(从-15A到-7A的相当宽度)意味着OB星的星周盘会被接近的中子星截断。光滑粒子流体动力学(SPH)模型被用来在观测到的行为背景下对系统进行建模，并预测相对于脉冲星轨道的星盘的几何形状。
X-ray photometry and optical spectra are presented covering the periastron passage of the highly-eccentric, ~50 year binary system PSR J2032+4127 in November 2017. This system consists of a 143 ms pulsar in orbit around a massive OB star, MT 91-213. The data show dramatic changes during the encounter as the pulsar wind collided with the stellar wind. The X-ray flux rose on the approach to periastron, then underwent a major dip in the few days around periastron, and then gradually declined over the next few weeks. The optical spectroscopy revealed a steady decline in the H? line strength on the approach to periastron (from an Equivalent Width of -15A to -7A) implying a truncation of the OB star's circumstellar disk by the approaching neutron star. Smooth Particle Hydrodynamic (SPH) modelling is used here to model the system within the context of the observed behaviour and predict the geometrical configuration of the circumstellar disk with respect to the pulsar's orbit.