【摘 要】
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We present our optical multi-color monitoring of the BL Lac object OJ 287 from January 2006to December 2012 in the V, R and I bands. A relatively active state i
【机 构】
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YunnanObservatories,KeyLaboratoryfortheStructureandEvolutionofCelestialObjects,CenterforAstronomical
【基金项目】
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supported by Fermi Guest Investigator grants NNX08AW56G, NNX09AU10G, NNX12AO93G and NNX15AU81G,,supported by the Strategic Priority Research Program of the Chinese Academy of Sciences-The Emergence of