Stellar spectrograph of the Belgrade Astronomical Observatory

The main features of the new SectraPro-750 spectrograph of Belgrade Astronomical Observatory are given in this paper. The instrumental profile of the spectrograph for the 1200 l/mm grating is determined using a fiber optic bundle with fibers arranged in a pseudo-slit pattern. This instrumental profile is compared to the instrumental profiles obtained when the same fiber optic bundle illuminates the entrance slit at different widths from appropriate instrumental profiles. The practical spectral purities and the spectral resolutions for different entrance slit widths are obtained. The variation of the reciprocal linear dispersion with wavelength in the spectral range 350 - 600 nm is presented.