Long-term monitoring of the broad-line region properties in a selected
  sample of AGN
  We present the results of the long-term optical monitoring campaign of active
galactic nuclei (AGN) coordinated by the Special Astrophysical Observatory of
the Russian Academy of Science. This campaign has produced a remarkable set of
optical spectra, since we have monitored for several decades different types of
broad-line (type 1) AGN, from a Seyfert 1, double-peaked line, radio loud and
radio quiet AGN, to a supermassive binary black hole candidate. Our analysis of
the properties of the broad line region (BLR) of these objects is based on the
variability of the broad emission lines. We hereby give a comparative review of
the variability properties of the broad emission lines and the BLR of seven
different type 1 AGNs, emphasizing some important results, such as the
variability rate, the BLR geometry, and the presence of the intrinsic Baldwin
effect. We are discussing the difference and similarity in the continuum and
emission line variability, focusing on what is the impact of our results to the
supermassive black hole mass determination from the BLR properties.
