Author(s)

Zhou Li, Wang Lisha, Xu Guangyang, Zhang Yao, Li Xiaopan

Corresponding Author

Zhou Li

Abstract

Based on the introduction of blazer, BL Lac object and SMARTS project, this paper briefly analyses the historical optical variation curve and color index change curve of a typical BL Lac object AO 0235+164 band. The results show that the target optical variation activity is intense, and the color index change shows the characteristics of BWB. This paper analyzes the Long-term timescales color change of five BL Lac objects in the SMARTS source. Among them, AO 0235+164, 0531-4827 and OJ 287 exhibited the color change characteristics of BWB, while 2155-304 and PKS 0426-380 did not exhibit color change.

Keywords

Optical variation, color index change, correlation