脉冲星计时模型参数的测量精度分析与估计  

Analyses and estimates on measurement precisions of model parameters in pulsar timing

作　　者：童明雷[1,2] 杨廷高[1,2] 赵成仕[1,2] 高玉平[1,2] TONG MingLei YANG TingGao ZHAO ChengShi GAO YuPing(National Time Service Center, Chinese Academy of Sciences, Xi＇an 710600, China Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi＇an 710600, China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院时间频率基准重点实验室,西安710600

出　　处：《中国科学：物理学、力学、天文学》2017年第9期99-108,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:U1531112;11103024;11373028;11403030);中国科学院"西部之光"青年学者A(XAB2015A06)项目;陕西省青年科技新星项目(编号:2015KJXX-56)资助

摘　　要：脉冲星计时模型参数的精确测定是脉冲星计时应用的基础.脉冲星计时模型包含几何的、物理的、轨道的等各种效应.我们主要分析了一些位置、自行、视差等几何效应的误差以及双星轨道模型误差引起的计时残差.本文将地球公转视为椭圆轨道,在黄道坐标系里得到了一般性的结论.基于此,我们给出了估计这些模型参数理论测量精度的解析表达式,得到了一些模型参数测量精度对黄纬的依赖关系.尤其是对于视差测量精度的估计,得到了与以前的工作显著不同的结果,这对于实际观测中脉冲星的选择具有参考意义.The precise measurements of the model parameters in pulsar timing are the basis of the applications of pulsar timing. Pulsar timing model contains geometrical, physical, orbital effects, and so on. In this paper, we regarded the Earth＇s revolution as the elliptical orbit and obtained general conclusions in the ecliptic system of coordinates. Based on that, we gave the analytic expressions of estimating the measurement precision of these model parameters, and obtained the measurement precision of some model parameters depending on ecliptic latitude. In particular, for the estimation of the measurement precision of the parallax, a quite different result from the previous work was obtained. This is meaningful for the choices of pulsars in the practical observations.

关 键 词：脉冲星 计时模型 椭圆轨道 解析模型 测量误差 

分 类 号：P145.6[天文地球—天体物理]