CCD PHOTOMETRIC MONITORING OF THE BL LACERTAE OBJECT S5 0716+714 FROM 2001 TO 2006

Abstract

We present the optical photometries (B, V, R, and I) of the BL Lac object S5 0716+714 (z > 0.3), which were observed with the 1 m telescope at Yunnan Astronomical Observatory and the 1.56 m telescope at Shanghai Astronomical Observatory from 2001 February to 2006 April. Our results show a significant rapid variation and exhibit a short time variability of ΔI = 0.60 mag in 28 minutes, ΔR = 1.58 mag in 23 minutes, ΔV = 1.06 mag in 10 minutes, and ΔB = 1.36 mag in 33 minutes. We find a strong correlation between the V − R color index and the magnitude in 292 minutes. Our CCD photometry of the S5 0716+714 showed they are in good similitude with Raiteri et al., and Qian et al. presented the optical variability magnitude and light curves from 1994 to 2001.