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

@article{Wu2006OpticalMO,
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},
year={2006},
volume={132},
pages={1256-1266}
}
• Published 22 May 2006
• Physics
• 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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