Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..555z&link_type=abstract
Chinese Journal of Astronomy & Astrophysics, Vol. 1, pp. 555-562
Astronomy and Astrophysics
Astrophysics
20
Instrumentation: Spectrographs, Methods: Observational, Techniques: Spectroscopic
Scientific paper
A brief description of the NAO coudé echelle spectrograph mounted on the 2.16 m telescope at Xinglong station is given. This echelle spectrograph is located at the coudé focus with a prism cross disperser. The echelle image covers the spectral region from 330 to 1100 nm displayed in 80 spectral orders in one exposure through two light beams. With a slit height of 2 mm, spectral orders are separated by 15 to 23 pixels in blue region and by 7 to 19 pixels in red region. Alternatively, two additional resolution modes corresponding to different focal length cameras with resolving power R =16 000, 170 000 in the blue beam and R = 13 000, 170 000 in the red beam could be provided by this spectrograph. The bias, dark, wavelength calibration, flat field and science exposure are described in details. The limiting magnitude for 1 hour exposure with an S/N ratio of 100 scales to V = 9.5 in the red path and to V = 7.2 in the blue path.
Li Hong-Bin
Zhao Gang
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