Free Access
Table 1
Basic features of CAFE.
| Design | Échelle spectrograph |
| Telescope | Calar Alto 2.2 m |
| Resolution | 62 000 ± 5000 Å |
| Wavelength | 3960–9500 Å |
| Sensitivity | SNR ~ 30 mag 14.5 and 2700 s |
| TELESCOPE MODULE | |
|
|
|
| Calibration lamps | Hal and ThAr |
| Entrance diaphragm | 2.4 arcsec (200 μm) |
| OPTICAL FIBER | |
|
|
|
| Type | Polymicro FBP100140170 |
| Length | 17.5 m |
| Inner protection tube | ETFE with Kevlar for strain relief |
| Outer protection tube | stainless-steel tube |
| Micro-lenses | N-F2, both ends |
| SPECTROGRAPH | |
|
|
|
| Optical bench | 2400 × 1200 × 203 mm |
| Entrance slit width | 100 μm |
| Grating | 31.6 g/mm Blaze angle = 63.9 degrees |
| Collimators | OAP1 λ/20 FL = 60.0 D = 10.0 OAD = 7.0 |
| OAP2 λ/20 FL = 60.0 D = 10.0 OAD = 9.0 | |
| Prisms | LF5, Deviation angle 33 degrees |
| Camera | f/3 |
| CCD back-illuminated | 2048 × 2048 pixels, 13.5 μm |
Notes. (*) OAP: Off axis parabola, FL: focal length. OAD: off axis distance with respect to the center of the mirror. These magnitudes are given in inches.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.