Optical variation and outburst of OJ 287 |
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| Institution: | 1. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;2. 801 Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology & Mineral Resources, Jinan 250014, China;3. Key Laboratory of Groundwater Resources and Environment, Shandong Provincial Bureau of Geology & Mineral Resources, Jinan 250014, China;4. Shandong Engineering Research Center for Groundwater Environmental Protection and Remediation, Jinan 250014, China;5. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;1. College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China;2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China;3. School of Life Sciences, Henan University, Kaifeng 475004, China;4. CAS Center for Excellence in Quaternary Science and Global Change, Xi''an 710061, China;1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;2. Qinghai Provincial Key Laboratory of Restoration Ecology in Cold Region, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810000, PR China;3. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810000, PR China;4. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, PR China;5. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, PR China;6. University of Chinese Academy of Sciences, Beijing, PR China;7. Qunjia State Forest Farm, Huangzhong County, Xining 810000, PR China;1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Forestry, Northwest A&F University, Yangling 712100, PR China;2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water conservation, Northwest A&F University, Yangling 712100, PR China;3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry Water Resources, Yangling 712100, PR China;4. Sichuan Academy of Giant Panda, Chengdu 610041, PR China;5. Department of Agroecology, University of Bayreuth, Bayreuth, Germany |
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| Abstract: | We monitored by photographic photometry the BL Lac object OJ 287 continuously during the 4-year period 1980–1984 and obtained the following results: (1) We confirm a previously proposed light variation on a time scale of about 8 days with an amplitude of 0.37 mag in B. (2) During the period 1980–1982, OJ 287 was stable and faint B = 15.61 mag at its faintest; while in March 1983, we observed an outburst (B = 14.25 mag). (3) Comparison star No. 9 given in Crain's handbook is probably a variable star. (4) A light curve based on all the published photographic data over the period 1968–1984 shows evidence for variations of large amplitudes (ΔB = 1.25–4.00 mag) over time scales of 2–4 years, in addition to the short term variation mentioned above. |
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