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Comune di Capannori

CCD Spectrography


Optical low resolution long slit spectrum of star 90 PSC

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.

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.

 

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



Spectra of calibration lamps

Below we show some tracings of both moderately high dispersion and medium dispersion long slit CCD calibration lamp spectra:

Hydrogen (blue region)
Neon (red region)
Mercury



CCD Spectrography of variable stars

The spectroscopy of variable stars can give us many information about the nature of variable stars: especially if it is performed almost simultaneously to the photoelectric photometry. At OAC we are interested in CCD spectrography of variable stars too. In the following lines there is a link to a sub-subpage about our CCD spectrography of variable stars.

CCD spectrography of variable stars

 

 

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