1994PASP..106.1157L

Query : 1994PASP..106.1157L

1994PASP..106.1157L - Publ. Astron. Soc. Pac., 106, 1157-1164 (1994/November-0)

Sky subtraction with fiber spectrographs.

LISSANDRINI C., CRISTIANI S. and LA FRANCA F.

Abstract (from CDS):

The sky subtraction performance of multi-fiber spectrographs are discussed, analyzing in detail the case of the OPTOPUS system at the 3.6 meter ESO telescope at La Silla. A standard technique, based on flat-fields obtained with a uniformly illuminated screen on the dome, provides poor results. A new method has been developed, using the [O I] emission line at 5577 A as a calibrator of the fiber transmittance, taking into account the diffuse light and the influence of each fiber on the adjacent ones, and correcting for the effects of the image distortions on the sky sampling. In this way the accuracy of the sky subtraction improves from 2-8% to 1.3-1.6%.

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SA 94- reg 02 55 58.10 +00 30 03.6           ~ 47 0

Query : 1994PASP..106.1157L

Basic data :
SA 94- -- Region defined in the Sky
Other object types: otypes_help 		reg (), * (SA)
ICRS coord. (ep=J2000) : 		02 55 58.10 +00 30 03.6 [ ] D 2012ApJ...744...25C
FK4 coord. (ep=B1950 eq=1950) : 		02 53 24.03 +00 17 58.6 [ ]
Gal coord. (ep=J2000) : 		175.33660 -49.26971 [ ]
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SA 94-

References (47 between 1850 and 2026) (Total 47)
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