用加权小波变换分析BL Lac天体的光变周期  

Computing the Period of Light Variability in BL Lac Objects Using the Weight Wavelet Z-transform

作　　者：徐云冰[1] 张皓晶[1] 张雄[1] 

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650092

出　　处：《云南师范大学学报（自然科学版）》2013年第5期9-17,共9页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：国家自然科学基金资助项目(11063004);云南省高校天体物理创新团队资助项目

摘　　要：介绍了一种基于小波分析原理的BL Lac天体光变周期分析方法——加权小波Z变换(Weight Wavelet Z-transform,WWZ).收集了BL Lac天体ON 231和OJ 287比较完备的观测数据,获得其长期光变曲线,利用加权小波Z变换给出了其长光变周期,ON 231的周期是13.70a和6.85a,OJ 287的周期是11.42a.分析计算表明:加权小波Z变换非常适合处理非等间隔数据,它解决了离散小波变换不能处理的非等间隔数据问题,并且能有效去除边界效应的影响。A method based on the principle of wave analysis called the Weighted Wavelet Z-transform （WWZ） is presented for finding the period of light variation in BL Lac objects.All available optical data of ON 231 and OJ 287 are collected in this paper,and the long-term curves of ON 231 and OJ 287 are presented.With the WWZ method,The authors find the long periods light variability in the BL Lac objects ON 231 and OJ 287,which of ON 231 are 13.70 and 6.85 yr,of OJ 287 is 11.42 yr.Analysis and computing have shown that Weighted wavelet Z-transform is very suitable for handling non-interval data,it have addressed that the discrete wavelet transform can not handle the problem of non-interval data,and can effectively remove the boundary effect.

关 键 词：小波变换 加权小波变换 光变曲线 周期 

分 类 号：P12[天文地球—天体测量]