Optical monitoring and intra-day variabilities of BL Lac Objects OJ 287

作     者：Yu-Hai Yuan Jun-Hui Fan Hong Wu Jing-Meng Hao Wei-Rong Huang Xiao-Lan Liu Hong-Ren Huang Yu-Hai Yuan;Jun-Hui Fan;Hong Wu;Jing-Meng Hao;Wei-Rong Huang;Xiao-Lan Liu;Hong-Ren Huang

作者机构：Center for AstrophysicsGuangzhou UniversityGuangzhou 510006China Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong ProvinceGuangzhou 510006China Key Laboratory for Astronomical Observation and Technology of GuangzhouGuangzhou 510006China Key Laboratory of Optical AstronomyNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2021年第21卷第6期

页      面：263-275页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：partially supported by the National Natural Science Foundation of China(Grant Nos.U1831119,U1531245,U1431112,11733006,11503004 and 11403006) Science and Technology Program of Guangzhou(201707010401) 

主　　题：quasars:individual(OJ 287) photometry 

摘      要：Using the 1.26 m National Astronomical Observatory-Guangzhou University Infrared/Optical Telescope(NGT),we monitor one BL Lac object,OJ *** this source,we obtain 15094 gri observations(4900 at g band,5184 at r band and 5010 at i band)in 155 nights from 2014 December 13 to 2019 *** on the upper observations,we obtain the following results.(1)The total variation amplitude is~2.3 mag.(2)There are intra-day variabilities(IDVs).The IDV timescales(△T)are in the range from 7.69 min(Δm=0.06±0.02 mag)to 371.09 min(Δm=0.26±0.04 mag).(3)There are strong correlations betweenΔT andΔm,△m=(2.91±0.66)×10^(-4)ΔT+(0.08±0.009),with r=0.52,p=5.33×10^(-5).(4)There are intra-day periods in this source,with the period P≈94 min on 2017 December *** we supplement the observations from the literature,we can obtain that the long-term period is about 12.02±0.41 yr.(5)The spectral properties of OJ 287 show the bluer-when-brighter behavior,whatever state the source is at.