the B&C+CCD spectrograph on the Asiago & Padova Obs. 1.22 m telescope

First Results

observers: Munari, Tomov, Tomasella

August 29, 1998

We present some results from first observations we obtained a few days ago (Aug 25 and 26, 1998) with the B&C spectrograph just installed on the refurbished 1.22 m reflector in Asiago and still under commissioning. They are intended to preliminary document the type of results one may obtain at the lowest (150 ln/mm grating) and highest (1200 ln/mm grating) of possible dispersions. For the timely nature of this document as well as some technical shortcomings to be fixed (with flat fielding, encoders and the software controlling the CCD) the extraction and calibration of the presented spectra by no mean can be considered final or bugs-free.

The spectra have been treated in a standard fashion and calibrated into absolute fluxes (flat fielding was however not applied). The spectra have been extracted and calibrated with IRAF v2.11 under Linux. The graphics and plots has been prepared using WIP under Linux.

The TV guiding camera (looking directly onto the slit) in no-moon conditions and normal transparency sky has been found to detect normal color objects as faint as V=16.0 (the limit for direct placing on the slit being V=15.0 mag) at 20 millisec exposure and no integration (video mode). The field of view is 3.5 arcmin, with appreciable vignetting toward the borders.

go to 150 ln/mm or 1200 ln/mm spectra