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

¹ Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
e-mail: aarentsen@aip.de
² Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands
³ Centre de Recherche Astrophysique de Lyon (CRAL, CRNR, UMR 5574), Université Lyon 1, ENS de Lyon, Université de Lyon, Lyon, France
⁴ Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
⁵ Observatoire Astronomique, 11 rue de l’Université, 67000 Strasbourg, France
⁶ European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
⁷ New York University Abu Dhabi, PO Box 129188, Abu Dhabi, United Arab Emirates
⁸ Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38205 La Laguna, Tenerife, Spain
⁹ Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
¹⁰ Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049 Cantoblanco, Spain

Received: 18 September 2018
Accepted: 3 May 2019

Abstract

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 <  T_eff <  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 T_eff, 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 (T_eff >  6500 K), these values are 2.6%, 0.20, and 0.10 for the three parameters.