强引力场下低质量X射线双星中X射线时变特征的研究

项目名称： 强引力场下低质量X射线双星中X射线时变特征的研究

项目编号： No.11203009

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 史常圣

作者单位： 海南大学

项目金额： 27万元

中文摘要： 在低质量X 射线双星中X 射线的光变主要来自吸积盘。X 射线双星里很重要 的时变现象就是准周期振荡，尤其是发生在中子星和黑洞低质量X 射线双星里的高频准周期 振荡。这些现象被认为是吸积物质在强引力场作用下出现的结果，因而对强引力场的研究和 广义相对论的验证有着重要意义。迄今还没有能自洽地同时解释中子星低质量X 射线双星和 黑洞低质量X 射线双星里的高频准周期振荡的理论模型，而且利用准周期振荡来检验强引力 场的效应还处于起步阶段。本工作将分析强引力场下具有不同结构的吸积盘的低质量X射线双星里的 X 射线的辐射特征，并对某些具体源的光变曲线进行拟合，力图解决重要的时变现象（特别是高频准周期振荡现象）的起源及其产生机制，建立统一的高频准周期振荡的理论模型，并由此寻找验证中子星和黑洞附近的广义相对论效应的方法。

中文关键词： X 射线双星；吸积盘；时变；准周期振荡；形成与演化

英文摘要： The X-ray variability in low mass X-ray binaries comes from the accretion disk and a crucial variability in X-ray binaries is the quasi-periodic oscillations. The high frequency quasi-periodic oscillations in neutron star low mass X-ray binaries and black hole low mass X-ray binaries, which are considered to be origined from accretion matter in strong gravity, are very attractive. They play an important role to study the strong gravity and check up the general relavity, but so far no self-consistent model can explain the high frequency quasi-periodic oscillations both in neutron star low mass X-ray binaries and in black hole low mass X-ray binaries. Furthermore, only a few people discussed that the strong gravity were tested by quasi-periodic oscillations. In this work we'll gather the radiation characteristic of the X ray in accreton disk with several configurations in low mass X-ray binaries in strong gravity, then fit the light curves of some sources and build a uniform self-consistent model for the high frequency quasi-periodic oscillation to clarify their origin and physics. At last we'll look for a way to test the results from the general relativity near the neutron star and the black hole according to that model.

英文关键词： X-ray binaries；accretion disk；variability；quasi-periodic oscillations；formation and evolution