Intra-day variability of BL Lacertae from 2016 to 2018

• 作者: Tian Li Jiang-Hua Wu Nan-Kun Meng Yan Dai Xiao-Yuan Zhang
• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2021,（10）
• 所属期刊栏目: Research Papers
• 页码范围: 187-196
• 页数: 10页
• 语种: 英文
• DOI: 10.1088/1674-4527/21/10/259

摘要

We monitored BL Lacertae in the B,V,R and I bands for 14 nights during the period of 2016-2018.The source showed significant intra-day variability on 12 nights.We performed color-magnitude analysis and found that the source exhibited bluer-when-brighter chromatism.This bluer-when-brighter behavior is at least partly caused by the larger variation amplitude at shorter wavelengths.The variations at different wavelengths are correlated well and show no inter-band time lag.