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TWIN is a two separate channels (blue & red) spectrograph that provides intermediate spectral resolution (R=3000-14000) in the wavelength range from 3200 to 11000 Å, by means of four beam dividers and twelve diffraction gratings.
Available at: Cassegrain station of the Zeiss 3.5 m reflector
Contact:
In a nutshell
| Observing technique | Simoultaneous medium resolution spectroscopy of two bands in the visible | |
| Dispersion | From 0.27 to 2.40 Å/pix | |
| Wavelength range | From 3200 to 11000 Å | |
| Slits | 4 arcmin length and widths of 0.9, 1.2, 1.5, 1.8, 2.1, 2.4, 3.5 and 10.0 arcsecs | |
| Beam dividers | 4500, 5500, 6800 and 7500 Å | |
| Gratings | 270, 300, 400, 600, 830 and 1200 lines/mm | |
| CCDs | 2 SITe 2000x800 pix, 15μ (0.56") | |
| Wavelength cal. lamps | Th-Ar, He-Ar, Ne and Fe-Ne | |
| A&G FoV | Adq. 5x5, Slit view 4x3 arcmin |
Observing with TWIN
Observer's Guide
Signal Calculator
Requesting obserrvation time for TWIN
TWIN it is not offered in 2020B semester
Night logsheet
More information
Technical data
Gratings
Wavelength calibration lamps
CCDs basic parameters
CCDs linearity
Flexures
Calar Alto Press releases
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