The AMBRE Project: Stellar Parameterisation of the ESO:UVES archived spectra

TL;DR

The AMBRE Project analyzed ESO:UVES archived spectra to determine stellar parameters for FGKM stars, providing a large homogeneous dataset with typical errors of about 110K in temperature and 0.13dex in metallicity, covering over 12,000 spectra.

Contribution

This work presents the first large-scale homogeneous parameterization of ESO:UVES archived spectra for FGKM stars using the MATISSE algorithm, covering over 12,000 spectra and reporting detailed stellar parameters.

Findings

Stellar parameters were obtained for 12,403 spectra (~23.9% of analyzed data).

Radial velocities were reported for 36,881 spectra (~71%).

Typical errors include ~110K in temperature and 0.13dex in metallicity.

Abstract

The AMBRE Project is a collaboration between the European Southern Observatory (ESO) and the Observatoire de la Cote d'Azur (OCA) that has been established in order to carry out the determination of stellar atmospheric parameters for the archived spectra of four ESO spectrographs. The analysis of the UVES archived spectra for their stellar parameters has been completed in the third phase of the AMBRE Project. From the complete ESO:UVES archive dataset that was received covering the period 2000 to 2010, 51921 spectra for the six standard setups were analysed. The AMBRE analysis pipeline uses the stellar parameterisation algorithm MATISSE to obtain the stellar atmospheric parameters. The synthetic grid is currently constrained to FGKM stars only. Stellar atmospheric parameters are reported for 12,403 of the 51,921 UVES archived spectra analysed in AMBRE:UVES. This equates to ~23.9% of the sample and ~3,708 stars. Effective temperature, surface gravity, metallicity and alpha element to iron ratio abundances are provided for 10,212 spectra (~19.7%), while at least effective temperature is provided for the remaining 2,191 spectra. Radial velocities are reported for 36,881 (~71.0%) of the analysed archive spectra. Typical external errors of sigmaTeff~110dex, sigmalogg~0.18dex, sigma[M/H]~0.13dex, and sigma[alpha/Fe]~0.05dex with some reported variation between giants and dwarfs and between setups are reported. UVES is used to observe an extensive collection of stellar and non-stellar objects all of which have been included in the archived dataset provided to OCA by ESO. The AMBRE analysis extracts those objects which lie within the FGKM parameter space of the AMBRE slow rotating synthetic spectra grid. Thus by homogeneous blind analysis AMBRE has successfully extracted and parameterised the targeted FGK stars (23.9% of the analysed sample) from within the ESO:UVES archive.