Jianghua Wu, Markus Boettcher, Xu Zhou, Xiangtao He, Jun Ma, Zhaoji Jiang
We present the results of our optical monitoring of the BL Lac object S5
0716+714 on seven nights in 2006 December. The monitoring was carried out
simultaneously at three optical wavelengths with a novel photometric system.
The object did not show large-amplitude internight variations during this
period. Intranight variations were observed on four nights and probably on one
more. Strong bluer-when-brighter chromatism was detected on both intranight and
internight timescales. The intranight variation amplitude decreases in the
wavelength sequence of B', R', and V'. Cross correlation analyses revealed that
the variability at the $B'$ and $V'$ bands lead that at the $R'$ band by about
30 minutes on one night.
View original:
http://arxiv.org/abs/1202.3226
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