Abstract
Based on the new data from the database of the University of Michigan Radio Astronomy Observatory (UMRAO), we analyze the spectral index and optical variability of OJ287 and 3C279. The main results show that 1) the time delay among three radio bands (4.8, 8, and 14.5 GHz) shows: τ8−14.5 = 31 d, τ4.8−8 = 41 d for OJ287, but no time delay lying in 3C279; 2) strong correlation lies in the polarization and flux density at 8 GHz for OJ287 and at 8, 14.5 GHz for 3C279; 3) the logarithmic brightness temperature log(TB) = 14.1 K for OJ287 is 14.1 K, log(TB) = 15.1 K for 3C279.
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