The FORS1 catalogue of stellar magnetic field measurements
S. Bagnulo, L. Fossati, J.D. Landstreet, C. Izzo

TL;DR
This paper presents a comprehensive, re-analyzed catalogue of magnetic field measurements from the FORS1 instrument, providing a valuable resource for studying stellar magnetism and assessing instrument performance.
Contribution
It introduces a consistent data reduction and analysis pipeline applied to the entire FORS1 archive, creating a reliable and detailed magnetic field measurement catalogue.
Findings
Catalogue includes about 1400 observations of 850 stars.
Developed an estimator for measurement uncertainty based on signal-to-noise ratio.
Demonstrated the utility of FORS1 for studying larger stellar magnetic fields.
Abstract
The FORS1 instrument on the ESO Very Large Telescope was used to obtain low-resolution circular polarised spectra of nearly a thousand different stars, with the aim of measuring their mean longitudinal magnetic fields. A catalogue of FORS1 magnetic measurements would provide a valuable resource with which to better understand the strengths and limitations of this instrument and of similar low-dispersion, Cassegrain spectropolarimeters. However, FORS1 data reduction has been carried out by a number of different groups using a variety of reduction and analysis techniques. Our understanding of the instrument and our data reduction techniques have both improved over time. A full re-analysis of FORS1 archive data using a consistent and fully documented algorithm would optimise the accuracy and usefulness of a catalogue of field measurements. Based on the ESO FORS pipeline, we have developed…
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