CCD spectrography is a powerful tool for our understanding of the physical and chemical composition of the universe.
At OAC we regularly use two spectrographs:

• IRF's stellar self guiding spectrometer SBIG SGS, a Czerny-Turner style spectrometer
  
• OAC's CCD nebular spectrometer SBIG DSS-7
  

Moderately High dispersion CCD Spectrography

At OAC we are going to realize a library of moderately high dispersion CCD long slit stellar spectra, by means of the SGS spectrometer, at a dispersion of about 1.07Angstrom/pixel.
These spectra were taken by OAC's director M.M.M. Santangelo, sometimes with the help of his co-workers; one of them is shown below as a frame.

Moderately high resolution long slit spectrum of star 2 Ori

Below we show some tracings of (moderately) high dispersion long-slit CCD spectra of various stars and nebulae recorded at OAC.

• Mintaka(O9 II + O9 V) in the blue region - Dec 28th, 2012, with the 30 cm Schmidt-Cassegrain
• Mintaka(O9 II + O9 V) in the blue region - Jan 26th, 2013 with the 30 cm Schmidt-Cassegrain
• Mintaka(O9 II + O9 V) in the red region, with the 30 cm Schmidt-Cassegrain
• P Cyg (B1 Ia peq) in the blue region, with the 60 cm Cassegrain
• P Cyg (B1 Ia peq) in the red region, with the 60 cm Cassegrain
• Atik (B1 Ib) in the blue region, with the 60 cm Cassegrain
• Spica (B1 III) in the blue region, with the 30 cm Schmidt-Cassegrain
• Algenib (B2 IV) in the blue region, with the 60 cm Cassegrain
• 7 Hya (B3 V) in the blue region, with the 60 cm Cassegrain
• Iota Herculis (B3 V) in the blue region, with the 30 cm Schmidt-Cassegrain
• 42 Peg (B8 V) in the blue region, with the 60 cm Cassegrain
• 42 Peg (B8 V) in the yellow-red region, with the 60 cm Cassegrain
• 73 Cet (B9 III) in the red region, with the 60 cm Cassegrain
• Vega (A0 Va) in the blue region, with the 60 cm Cassegrain
• 2 Ori (A1 Vn) in the blue region, with the 60 cm Cassegrain
• Menkalinan A2 IV + A2 IV-V) in the blue region, with the 30 cm Schmidt-Cassegrain
• Menkalinan A2 IV + A2 IV-V) in the blue-green region, with the 30 cm Schmidt-Cassegrain
• Menkalinan A2 IV + A2 IV-V) in the red region, with the 30 cm Schmidt-Cassegrain
• HD 192678 (A2p Cr) in the blue region, with the 60 cm Cassegrain
• 52 Her (A3 Vp Sr-Cr-Eu) in the blue region, with the 60 cm Cassegrain
• Rasalhague (A5 III) in the blue region, with the 60 cm Cassegrain
• 10 Aql (A7 Vp Sr-Eu) in the blue region, with the 60 cm Cassegrain
• Zeta Leo (F0 III) in the blue region, with the 30 cm Schmidt-Cassegrain
• Procyon F5 IV-V) in the blue region, with the 30 cm Schmidt-Cassegrain
• Procyon F5 IV-V) in the red region, with the 30 cm Schmidt-Cassegrain
• 1 Ori (F6 V) in the blue region, with the 60 cm Cassegrain
• Sadalsuud (G0 Ib) in the blue region, with the 60 cm Cassegrain
• Sadalmelik (G2 Ib) in the yellow-red region, with the 60 cm Cassegrain
• Sadalmelik (G2 Ib) in the Ca II triplet NIR region, with the 60 cm Cassegrain
• M42 bright nebula in the blue-green region, with the 60 cm Cassegrain
  

In order to find the proper spectral range (namely the one which we are interested in) with the SGS spectrometer we need to turn properly the small control knob of the vernier which turns the diffraction grating. But before doing so we need to make a calibration of the vernier readings vs wavelength, In the following graph you can see such a calibration for the 1.07 Angstrom/pixel dispersion.

Medium dispersion CCD Spectrography

At OAC we are going to realize a library of medium dispersion CCD long slit stellar spectra, by means of the SGS spectrometer, at a dispersion of about 4.3 Angstrom/pixel.
These spectra were taken by OAC's director M.M.M. Santangelo, sometimes with the help of his co-workers; some of them (and cometary spectra too) are listed below both as tracings and as frames.

• Tracing of a medium dispersion long-slit CCD spectrum of Nusakan (F0 III), with the 30 cm Schmidt-Cassegrain
• Tracing of a medium dispersion long-slit CCD spectrum of Delta Aquilae (F3 IV or F0 IV), with the 30 cm Schmidt-Cassegrain
• Tracing of a medium dispersion long-slit CCD spectrum of HD 30652 (F6 V) with the 60 cm Cassegrain
• Tracing of a medium dispersion long-slit CCD spectrum of Chara (G0 V), with the 30 cm Schmidt-Cassegrain
• Tracing of a medium dispersion long-slit CCD spectrum of 5 Sge (G1 IIb), with the 60 cm Cassegrain
• Tracing of a medium dispersion long-slit CCD spectrum of Enif (K2 Ib), with the 60 cm Cassegrain
• Tracing of a medium dispersion long-slit CCD spectrum of Betelgeuse, (M1-M2 Ia Ibe) with the 30 cm Schmidt-Cassegrain
• Tracing of a medium dispersion long-slit CCD spectrum of the comet Lovejoy, with the 60 cm Cassegrain)

Medium dispersion long-slit CCD spectrum of Betelgeuse

In order to find the proper spectral range (namely the one which we are interested in) with the SGS spectrometer we need to turn properly the small control knob of the vernier which turns the diffraction grating. But before doing so we need to make a calibration of the vernier readings vs wavelength, In the following graph you can see such a calibration for the 4.3 Angstrom/pixel dispersion.

Low dispersion CCD Spectrography

At OAC we have realized a library of low dispersion stellar spectra named OAC-LSS, by means of the DSS-7 spectrometer.
The dispersion of OAC-LSS is about 12 Angstrom/pixel.
All spectra of OAC-LSS were taken by OAC's director M.M.M. Santangelo with the help of Mrs. M. Pasquini.

In the following link you'll find OAC-LSS library:
Stellar classification by means of CCD spectrography

In the following link you'll find the list of spectral lines identified in the spectra belonging to OAC-LSS library:
Low dispersion Spectra List