AMBRE/FEROS catalogue of line-broadening velocities

This fundamental step was performed by adopting the AMBRE grid of synthetic spectra. The derived Vbroad were then validated using literature, ground-based spectroscopic surveys, and Gaia/RVS data. After analysing more than 5,000 FEROS spectra (including repeated spectra for several stars), we provide the line-broadening coefficient for 2,584 stars covering the FGKM spectral types, any stellar gravity, and metallicities between the metal-poor up to sub-Solar regimes.

The mean Vbroad relative uncertainty of this sample is found to be smaller than 8%. As expected, most stars are found to be slow rotators (below a few km/s), in particular cool dwarfs and giants. A few hot dwarfs and high-luminosity stars with high-Vbroad rates are however identified, most of them being unknown as fast rotators and/or affected by large macro-turbulent effects before this work.

The measured rotational broadening values are of high-quality, based on literature comparisons. We provide this catalogue of line-broadening parameters, including stellar atmospheric and quality parameters, for the analysed AMBRE/FEROS sources.