The CCD-detectors in use are SITe-CCD's with 2000 x 800 Pixel à 15 µm especially dedicated to the TWIN-spectrograph (see also CCD detectors).
Width ["]: | 0.6, 0.9, 1.2, 1.5, 1.8, 2.1, 2.4, 3.5 |
Length: | 240" |
Focal length: | 230mm |
Scale: | 1" = 26.8 micrometer (slit direction) |
Field: | 7mm x 40mm |
Spectral resolution: | At 36Å/mm and slit width 1.2" (2.0") line width is < 0.9Å (1.3Å) |
Grating angle: | Adjustment accuracy: approx. 0.5Å at 36Å/mm |
Sensitivity: | Tests with an RCA CCD-chip gave a S/N = 32 (18) for a star with m = 17 (18) and 1h exposure time, at a resolution of 1Å in the region around Halpha (36Å/mm) |
No. | grooves | blaze angle | blaze | recommended application | |||
---|---|---|---|---|---|---|---|
1. order | range | order | dispersion | channel | |||
[lines/mm] | [degrees] | [Å] | [Å] | [Å/mm] | |||
T01 | 830 | 19 | 7700 | 6000-10000 | 1 | 52 | red |
3200-5000 | 2 | 26 | blue | ||||
T03 | 600 | 17 | 9500 | 7500-11000 | 1 | 72 | red |
3800-5500 | 2 | 36 | blue | ||||
T04 | 600 | 13 | 7100 | 5500-9000 | 1 | 72 | red |
3200-4500 | 2 | 36 | blue | ||||
T05 | 1200 | 17 | 4700 | 3700-6500 | 1 | 36 | blue |
T06 | 1200 | 26 | 7100 | 5500-9000 | 1 | 36 | red |
3200-4300 | 2 | 18 | blue | ||||
T07 | 400 | 9 | 8000 | 5500-11000 | 1 | 108 | red |
3300-5000 | 2 | 54 | blue | ||||
T08 | 600 | 9 | 4700 | 3500-6500 | 1 | 72 | blue |
T09 | 600 | 22 | 12000 | 8400-11000 | 1 | 72 | red |
5500-7500 | 2 | 36 | red | ||||
3500-4500 | 3 | 24 | blue | ||||
T10 | 830 | 30 | 11500 | 8400-11000 | 1 | 52 | red |
5500-7000 | 2 | 26 | red | ||||
4500-5500 | 2 | 26 | blue | ||||
T11 | 270 | 5 | 7200 | 5500-11000 | 1 | 160 | red |
3200-4500 | 2 | 80 | blue | ||||
T12 | 600 | 7 | 3800 | 3100-4800 | 1 | 72 | blue |
T13 | 300 | 4 | 4700 | 3500-5500 | 1 | 144 | blue |
5500-7000 | 1 | 144 | red |
Ulli Thiele