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We investigate the connection between the intrinsic C IV absorption linevariability and the continuum flux changes of broad absorption line (BAL)quasars using a sample of 78 sources in the Stripe 82 region. The absorptiontrough variability parameters are measured using the archival multi-epochspectroscopic data from the Sloan Digital Sky Survey (SDSS), and the continuumflux variability parameters are estimated from the photometric light curvesobtained by the SDSS and the Catalina Real-Time Survey (CRTS) surveys. We findevidence for weak correlations (\rho ~ 0.3) between the intrinsic C IVabsorption line variability and the quasar continuum variability for the finalsample of 78 BAL quasars. The correlation strengths improve (\rho ~0.5) for the"high-SNR" sample sources that have higher spectral signal-to-noise ratio.Using two sub-sets of the high-SNR sample differing on the absorption troughdepth, we find that the shallow trough sub-set shows an even strongercorrelation (\rho ~ 0.6), whereas the deep trough sub-set does not show anycorrelation between the absorption line variability and the continuumvariability. These results point to the important role of saturation effects inthe correlation between the absorption line variability and the continuumvariability of BAL quasars. Considering other effects that can also smear thecorrelation, we conclude that the actual correlation between the absorptionline and continuum variability is even stronger.

Ionization driven intrinsic absorption line variability of BAL quasars in the Stripe 82 region