Spectral lines unaffected by instrumental polarization. 1: Theory
We propose a new approach to minimize the instrumental polarization (IP) of current polarimetric observations. It is shown how the instrumental polarization can be deduced and removed, by using lines with no intrinsic linear polarization. Notably, no specific understanding of the polarizing properties of our optical setup is required. For the
Sanchez Almeida, J. et al.
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1993