The DFBS Spectroscopic Database and the Armenian Virtual Observatory

The DFBS is the digitized version of the famous Markarian Survey. It is the largest low-dispersion spectroscopic survey of the sky covering 17,000 square degrees at galactic latitudes |b|>15. DFBS provides images and extracted pectra for all objects present in the FBS plates. Programs were developed to compute astrometric solution, extract spectra, and apply wavelength and photometric calibration for objects. DFBS database and catalog has been assembled containing data for nearly 20,000,000 objects. A classification scheme for the DFBS spectra is being developed. The Armenian Virtual Observatory is based on the DFBS database and other large-area surveys and catalogue data.