Available filters for CAIN
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The infrared camera CAIN-3 has a filter wheel with 9 positions, of which 7 are for normal filters (15 mm round), one is blocked and the other (“open”) has a lens to reimagine the image of the pupil onto the detector to align the dichroic.
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CAIN #
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FILTER
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CWL [nm]
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Width [nm]
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Tmax (%)
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Transmission (JPG)
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Transmission (ASCII)
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| 1 | J | 1266.25 | 280.5 | 78.14 | J | J |
| 2 | H | 1667.75 | 311.5 | 79.71 | H | H |
| 3 | K | 2227.5 | 372.0 | 69.88 | K | K |
| 4 | Kshort | 2194.0 | 292.0 | 83.38 | Kshort | Kshort |
| 5 | Kcont | 2278.45 | 50.9 | 85.07 | Kcont | Kcont |
| 6 | Kcont | 2277.5 | 50.2 | 83.69 | Kcont | Kcont |
| 7 | Paschen Beta | 1286.25 | 13.90 | 62.17 | Pb | Pb |
| 8 | Fe II | 1651.65 | 16.5 | 83.24 | Fe II | Fe II |
| 9 | H2 (1-0) | 2140.2 | 19.4 | 64.19 | H2 (1-0) | H2 (1-0) |
| 10 | H2 (1-0) | 2146.6 | 21.8 | 54.15 | H2 (1-0) | H2 (1-0) |
| 11 | Bracket Gamma | 2183.4 | 19.8 | 70.10 | Brg | Brg |
| 12 | H2 (2-1) | 2263.0 | 24.2 | 53.73 | H2 (2-1) | H2 (2-1) |
| 13 | H2 (2-1) | 2262.9 | 22.4 | 59.99 | H2 (2-1) | H2 (2-1) |
| 14 | Kcont | 2281.4 | 50.2 | 85.10 | Kcont | Kcont |
| 15 | CO (2-0) | 2311.4 | 21.2 | 70.29 | CO (2-0) | CO (2-0) |
| 16 | CO (2-0) | 2306.6 | 20.8 | 68.29 | CO (2-0) | CO (2-0) |
The observers must contact their support astronomer some months before their run to indicate any spetial filter requirements. The filter wheel is inside the cryostat, so once the cryostat is closed it will not be opened again until the camera is carried down to the IAC’s workshops at La Laguna.