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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.

Camera High Dispersion Low Dispersion

Full Coverage Partial Coverage

SWP 1145-1930 Å 1930-2198 Å 1150-1975 Å

LWR 1845-3105 Å 3105-3230 Å 1860-3300 Å

LWP 1845-2980 Å 2980-3230 Å 1910-3300 Å

Table 2.1: IUE Camera Wavelength Coverage

**Table 2.1:** IUE Camera Wavelength Coverage
Camera	High Dispersion	Low Dispersion
	Full Coverage	Partial Coverage

SWP	1145-1930 Å	1930-2198 Å	1150-1975 Å
LWR	1845-3105 Å	3105-3230 Å	1860-3300 Å
LWP	1845-2980 Å	2980-3230 Å	1910-3300 Å

Next: 2.3 The Fine Error Up: 2 Description of the Previous: 2.1 The Cameras

Last updated: 11 June 1997
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