Abstract
In this paper, the preliminary data from University of Michigan Radio Astronomy Observatory database (UMRAO) are used to discuss the radio spectral index properties of 8 BL Lacs. To do so, we calculated the radio spectral index, α (F ∝ ν α ), which was obtained by fitting the averaged flux densities in the bands (4.8 GHZ, 8 GHz, and 14.5 GHz) by binning the original for 7 d. We also calculated the time delay between the averaged lightcurves and the spectral variance. Our calculations and analysis give the following results. 1) The averaged logarithmic flux density at 8 GHz (logF) and the corresponding spectral index (α) have strong correlation for all the BL Lacs; 2) the lightcurves and the spectral variability have the similar profile for all the BL Lacs; 3) the lightcurves delay spectral variability for all sources but PKS 0735+178, with the delay time ranging from 31 d to 125 d.
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