Optical Monitoring of BL Lacertae Object OJ 287: A 40 Day Period?

  title={Optical Monitoring of BL Lacertae Object OJ 287: A 40 Day Period?},
  author={Jianghua Wu and Xu Zhou and Xue-Bing Wu and Fukun Liu and B. Peng and Jun Ma and Zhen-Yu Wu and Zhao-ji Jiang and Jian-sheng Chen},
  journal={The Astronomical Journal},
We present the results of our optical monitoring of the BL Lacertae object OJ 287 during the first half of 2005. The source did not show large-amplitude variations during this period and was in a relatively quiescent state. A possible period of 40 days was derived from its light curves in three BATC wave bands. A bluer-when-brighter chromatism was discovered, which is different from the extremely stable color during the outburst in 1994-1996. The different color behaviors imply different… 

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