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Paper: Optical Photometrical Observations of 3C273
Volume: 408, The Starburst−AGN Connection
Page: 306
Authors: Fan, J.H.; Peng, Q.S.; Tao, J.; Qian, B.C.; Shen, Z.Q.; Liu, Y.
Abstract: The quasar 3C273 is one of selected targets in our monitoring program. In this paper, we present the optical V, R and I photometric observations done with the 1.56 m telescope at the Shanghai Astronomical Observatory (ShAO) from 2000 to 2008. Our observations indicate that the variations in the three bands are ΔI = 1.04 ± 0.14 mag, ΔR = 1.30 ± 0.15mag and ΔV = 1.42±0.20 mag, a micro-variation of 0.18 mag over 2.1hrs is detected in R band. The color indices are in the ranges: V-R = 0.09 to 0.55, V-I = 0.33 to 1.13, and R-I=0.12 to 0.73, and their averages are: V-R = 0.30±0.10,V-I = 0.73±0.16, R-I = 0.42 ± 0.12.
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