用Jurkevich方法分析计算BL Lac天体的光变周期

本文介绍一种分析寻找ＢＬＬａｃ天体光变周期的方法，给出了ＢＬＬａｃ天体ＯＪ２８７，ＯＮ２３１，Ｍｒｋ４２１的长光变周期．分析计算表明：当观测样品的数据点很多、观测时间很长（大约１００年左右的光学波段数据）、数据样本不少于６个周期并能从光变曲线的两次大振幅中，看出有若干小振幅的周期时，则能用该方法准确地认证和确定其长周期值．这种方法在寻找周期时，对无规律不等间隔的样品数据有较高的灵敏度，而计算方法简捷实用，结果可靠

Computing the Period of Light Variability in BL Lac Objects using the Jurkevich Method

The authors present a method for finding the period of light variation in BL Lac objects.The authors find the long periods light variability in the BL Lac objects OJ 287,ON 231 and Mrk 421.Analysis and computing have shown that the data sample should span a very long time interval(about 100 years),covering at least six times the length of the periodicity being claimed,the possible period should refer to large amplitude variations and thus directly visible in the light curve.When the amplitude is low,far more than six times of the period length will be necessary to demonstrate its reality.The method is very sensitive in finding a periodicity in an unequally-spaced data sequence.The method is simple in computing and yields accurate results.We conclude that the method is the best way for period search in BL Lac objects.