Sky Subtraction with Fiber-Spectrographs

Details Sky Subtraction with Fiber-Spectrographs Sky Subtraction with Fiber-Spectrographs

1994-08-26

arxiv.org/abs/astro-ph/9408085v1

Publ.Astron.Soc.Pac. 106 (1994) 1157

Astronomy and Astrophysics

Astrophysics

19 pages Plain Tex Tables and Figures available on request To appear in the Pub. A. S. P. KEYPD-1-94-AUG-26

Scientific paper

10.1086/133493

The sky subtraction performances of multi-fiber spectrographs are discussed, analysing 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 [OI] emission line at 5577 \AA\ 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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