  Context. There are more than 3000 confirmed and probable known Galactic
planetary nebulae, but central star spectroscopic information is available for
only 13% of them. Aims. We undertook a spectroscopic survey of central stars of
PNe to identify their spectral types. Methods. We performed spectroscopic
observations, at low resolution, with the 2-m telescope at CASLEO, Argentina.
Results. We present the spectra of 46 central stars of PNe, most of them are
OB-type and emission-line stars.
