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.
@article{arxiv.1609.06142,
title = {On-sky tests of sky-subtraction methods for fiber-fed spectrographs},
author = {Myriam Rodrigues and Michele Cirasuolo and Francois Hammer and Frederic Royer and C. J. Evans and Mathieu Puech and Hector Flores and Isabelle Guinouard and Gianluca Li Causi and Karen Disseau and Yanbin Yang},
journal= {arXiv preprint arXiv:1609.06142},
year = {2016}
}