Abstract
BL Lac object S5 0716+714 is a well-studied object. In this paper, the available optical (BVRI) data of this source are compiled, and the B-, V-, R- and I-band light curves are constructed. Each of them is analyzed by means of the discrete correlation function (DCF) method, the structure function (SF) method and the z-transformed discrete correlation function (ZDCF) method. The results imply that there is a possible periodic variation of 1211 days in each passband light curve. The source varies violently and complicatedly, and exhibits a brightening trend in the light curves.
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Zhang, B., Dai, B., Zhang, L. et al. The long-term optical behavior of BL Lac object S5 0716+714. Sci. China Phys. Mech. Astron. 53, 1370–1374 (2010). https://doi.org/10.1007/s11433-010-4011-4
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DOI: https://doi.org/10.1007/s11433-010-4011-4