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2.2 The Spectrograph

With the LWP, LWR and SWP cameras, the spectrographs cover the spectral ranges given in Table 2.1. Gaps in wavelength coverage in high dispersion are caused by truncation of the lower orders by the edge of the camera faceplate.

Each spectrograph has two entrance apertures. The small aperture is a circle 3 arc seconds in diameter; the large aperture is a 10 x 20 arc second oval. More precise dimensions are given by Panek (1982a, b) and Crenshaw and Park (1989). The throughput of the small aperture is 50 ± 25 percent, varying from image to image.

 
CameraHigh DispersionLow Dispersion
  Full CoveragePartial Coverage 
    
SWP1145-1930 Å1930-2198 Å1150-1975 Å
LWR1845-3105 Å3105-3230 Å1860-3300 Å
LWP1845-2980 Å2980-3230 Å1910-3300 Å
Table 2.1: IUE Camera Wavelength Coverage


next up previous contents
Next: 2.3 The Fine Error Up: 2 Description of the Previous: 2.1 The Cameras

Last updated: 11 June 1997
jrc