Abstract.
We monitored the BL Lac object S5 0716+714 in five intermediate optical passbands from 2004 September to 2011 April. The object was active most of the time and intra-day variability was frequently observed. The total variation amplitude tended to decrease with decreasing frequency. Strong bluer-when-brighter chromatism was observed on both long and short timescales.
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Acknowledgements
We thank the anonymous referee for his/her comments and suggestions. This work is supported by the Chinese National Natural Science Foundation (Grant No. 11273006) and the National Basic Research Programme of China 973 Program 2013CB834900.
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Wu, J., Dai, Y., Zhou, X. et al. Seven-Year Multi-Colour Optical Monitoring of BL Lacertae Object S5 0716+714. J Astrophys Astron 35, 315–319 (2014). https://doi.org/10.1007/s12036-014-9220-1
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DOI: https://doi.org/10.1007/s12036-014-9220-1