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Optical observations of BL Lacertae in 2004–2005
Author(s) -
Youhong Zhang,
Fuyan Bian,
Jun-Zheng Li,
Ren-Cheng Shang
Publication year - 2013
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-8711
pISSN - 0035-8711
DOI - 10.1093/mnras/stt534
Subject(s) - physics , bl lac object , astrophysics , brightness , blazar , light curve , flare , astronomy , amplitude , jet (fluid) , gamma ray , optics , thermodynamics
We present optical observations of BL Lacertae (BL Lac) in the standard BVRI bands with the 80 cm Tsinghua Centre for Astrophysics–National Astronomical Observatories of China telescope. In 2004, BL Lac was monitored for 25 nights, between September and November, to study its long-term optical variability behaviour. The source initially faded by ΔR ∼ 1 mag in ∼30 d and then brightened by ΔR ∼ 0.8 ...

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