蝎虎天体S5 0716+714的多波段光变

Multi-waveband Variability of the BL Lac Object S5 0716+714

对Swift/UVOT望远镜的观测数据进行处理,得到了蝎虎天体S5 0716+714从2005年到2016年的光学B和V波段历史光变曲线,并计算了其色指数B-V.对该源的光变特性进行研究,结果表明:(1)S5 0716+714光变活动十分剧烈,V和B波段光变有强相关性;(2)S5 0716+714在中等时标上存在BWB(bluer-whenbrighter)和RWB(redder-when-brighter)的颜色变化特性,在长时标范围上没有明显的颜色变化.

We present the B-and V-band light curves and the corresponding color index B-V curve of BL Lac object $5 0716 ＋ 714 in 2005-2016 by performing the original observation data taken from Swift/UVOT archive. S5 0716 ＋ 714 shows strong optical variability with well-correlated light curve in the V and R bands. The correlation between flux varia-bility and color index indicates that S5 0716＋ 714 exhibits BWB（bluer-when-brighter） and RWB（redder-when-brighter） features during medium-term timescale, and a mildly chromatic behaviour during long-term tirnescale