Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral Library

Anke Arentsen, Philippe Prugniel, Anais Gonneau, Ariane Lançon, Scott Trager, Reynier Peletier, Mariya Lyubenova, Yan-Ping Chen, Jesús Falcón Barroso, Patricia Sánchez Blázquez, Alejandro Vazdekis

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Context. The X-shooter Spectral Library (XSL) is an empirical stellar library at medium spectral resolution covering the wavelength range from 3000 Å to 24 800 Å. This library aims to provide a benchmark for stellar population studies. Aims: In this work, we present a uniform set of stellar atmospheric parameters, effective temperatures, surface gravities, and iron abundances for 754 spectra of 616 XSL stars. Methods: We used the full-spectrum fitting package ULySS with the empirical MILES library as reference to fit the ultraviolet-blue (UVB) and visible (VIS) spectra. We tested the internal consistency and we compared our results with compilations from the literature. Results: The stars cover a range of effective temperature 2900 < Teff <38 000 K, surface gravity 0 <logg <5.7, and iron abundance -2.5 <[Fe/H] <+1.0, with a couple of stars extending down to [Fe/H] = -3.9. The precisions of the measurements for the G- and K-type stars are 0.9%, 0.14, and 0.06 in Teff, logg, and [Fe/H], respectively. For the cool giants with logg <1, the precisions are 2.1%, 0.21, and 0.22, and for the other cool stars these values are 1%, 0.14, and 0.10. For the hotter stars (Teff > 6500 K), these values are 2.6%, 0.20, and 0.10 for the three parameters. Full Tables A.1-A.3 are only available at the CDS via anonymous ftp to ( or via on ESO observations from run IDs 084.B-0869(A/B), 085.B-0751(A/B) and 189.B-0925(A/B/C/D).
Original languageEnglish
Article numberA138
Number of pages14
JournalAstronomy & astrophysics
Publication statusPublished - 1-Jul-2019


  • atlases
  • stars: fundamental parameters
  • methods: data analysis
  • techniques: spectroscopic

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