On-sky tests of sky-subtraction methods for fiber-fed spectrographs
2012
We present preliminary results on on-sky test of sky subtraction methods for fiber-fed spectrograph. Using
dedicated observation with FLAMES/VLT in I-band, we have tested the accuracy of the sky subtraction for 4
sky subtraction methods: mean sky, closest sky, dual stare and cross-beam switching. The cross beam-switching
and dual stare method reach accuracy and precision of the sky subtraction under 1%. In contrast to the commonly
held view in the literature, this result points out that fiber-fed spectrographs are adapted for the observations
of faint targets.
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