Long-term optical color behavior of a sample of blazars

作     者：Xiao-Pan Li Yu-Hui Luo Hai-Tao Yang Hai-Yan Yang Cheng Yang Yan Cai 

作者机构：College of Physics and Information Engineering Zhaotong University College of Photoelectron and Communication Engineering Yunnan Open University 

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

年 卷 期：2018年第18卷第12期

页      面：67-74页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：supported by the Education Department of Yunnan Province, China (Grant Nos.2017ZZX079, 2016ZZX230 and 2018JS506) the Youth Program of the Applied Basic Research Projects of Yunnan Province, China (Grant No.2017FD147) 

主　　题：galaxies:active BL Lacertae objects:general quasars:general methods:statistical 

摘      要：We report on the optical color variability of a sample of 24 blazars, consisting of nine flat spectrum radio quasars(FSRQs) and 15 BL Lacertae objects(BL Lacs), on timescales of years using simultaneous V-and R-band observations observed by the Kanata telescope at Higashi-Hiroshima *** correlations between color indices V-R and magnitudes reveal that 11 BL Lacs and one FSRQ exhibited significant(i.e., r 0.2 and P 0.01) bluer-when-brighter(BWB) trend and two FSRQs followed the redder-when-brighter(RWB) tend, indicating a possibility that the BWB chromatic trend is dominant for BL Lacs and the RWB trend is especially found in FSRQs, which has been presented occasionally in different samples of *** superpositions of the red emission component from the Doppler-boosted relativistic jet and the blue component arising from the accretion disk might be a possible interpretation for the long-term color behaviors.