M. Semel

TL;DR: In this paper, the results of five years (five runs, 23 nights) of spectropolarimetric observations of active stars with the UCL Echelle Spectrograph of the Anglo-Australian Telescope were reported.

TL;DR: In this article, the brightness and magnetic surface images of the young K0 dwarfs AB Doradus and LQ Hydrae were reconstructed from Zeeman-Doppler imaging spectropolarimetric observations collected at the Anglo-Australian Telescope during five observing campaigns (totalling 50 nights), from 1998 January to 2002 January.

TL;DR: The magnetic topology of AB Dor is found to be very complex, with at least 12 different radial field regions of opposite polarities located all around the star, and significant azimuthal field fluxes are also detected in the form of one negative polarity region close to the equator, a series of positive polarity patches at intermediate latitudes and an almost complete ring of negative polarities encircling the rotational pole at high latitudes as mentioned in this paper.

TL;DR: In this paper, the authors used least squares deconvolution to increase the signal-to-noise ratio of the data and applied Zeeman Doppler imaging to reconstruct brightness and magnetic surface topologies of the star HD 171488.

TL;DR: In this article, the first spectropolarimetric results obtained with the multiline spectroscopy mode (MTR) of THEMIS are presented, and the principal problems found during the data analysis are exposed.