Stokes<i>IQUV</i>magnetic Doppler imaging of Ap stars - I. ESPaDOnS and NARVAL observations
Stokes<i>IQUV</i>magnetic Doppler imaging of Ap stars - I. ESPaDOnS and NARVAL observations
In this paper we describe and evaluate new spectral line polarization observations obtained with the goal of mapping the surfaces of magnetic Ap stars in great detail. One hundred complete or partial Stokes IQUV sequences, corresponding to 297 individual polarized spectra, have been obtained for seven bright Ap stars using …