Mark 421多波段光变特性研究

multi-band optically Variable property of Mark421

文章收集了Mark421天体1974年至2005年的光学波段观测数据。通过对数据分析处理得到Mark421天体的U、B、V、R波段的短时标光变曲线和U、B、V、R、I波段的长期光变曲线。分析研究短时标的光变曲线图,发现Mark421存在最小短时标光变周期为230.4min。用线性拟合的方法计算了光学谱指数,得到平均光学谱指数为1.5454,从分析光学谱指数与星等之间的变化关系中,我们发现两者之间并没有相关性。用Jurkevich周期分析的方法,对Mark421天体B波段的长周期光变和谱指数分析,得出Mark421天体的光变和光学谱指数的变化都表现出周期性。

In this paper, we collected the datas of the optical band from 1974 to 2005 of Mark421 objects , Analyzed the datas of Mark421, we obtained U, B, V, R four--band short--time optically Variable curve and U, B, V, R, I--band light curve of the long--term optically Variable curve. The short--term optically Variable curve shows that the shortest short--term period of variation is 230. 4 minutes. Calculated optical spectral index by linear fitting, the result show that the average optical spectral index is 1. 5454. We do not find the relation between the optical spectral index and the magnitude. We used Jurkevich method to analyze the long period of light curve of Mark421in the B band, We found that long--term optically Variability and optical spectral index of Mark421 are periodic. We find which both are periodic about long--term optically Variability and optical spectral index of Mark421.