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WINERED (Warm INfrared Echelle spectrograph to Realize Extreme Dispersion and sensitivity) is a near-infrared high-resolution spectrograph developed by LiH. WINERED is a PI-type instrument. It was used with the 3.58m New Technology Telescope (NTT) at the La Silla Observatory, ESO, in 2017 and 2018. Observations with the Magellan Clay 6.5m telescope are being prepared aiming to make the first observing run in 2020 June. WINERED has three distinctive features: warm optics (no cold stop), wide spectral coverage (0.90−1.35 μm), and high sensitivity (the efficiency as high as 50%). WINERED has three observing modes: "WIDE" (R≡ λ/Δ λFWHM=28,000) plus “HIRES-Y” and “HIRES-J” (R=68,000).
1. Warm optics with no cold stop
(ⅰ) Optics are at room temperature except for the infrared camera system (camera lenses and an infrared array).
(ⅱ) Beneficial to reduce time and cost for development, alignment, and maintenance.
2. Wide spectral coverage
Achieved by a combination of decent optical design with a cross-dispersed echelle and a large format infrared array (2k x 2k).
3. High sensitivity
- HIRES-Y&J modes: high-blazed echelle gratings by Canon Inc. (>70%), VPH cross-dispersers (~90%).