The AMBRE Project: Parameterisation of FGK-type stars from the ESO:HARPS archived spectra

Abstract

The AMBRE project is a collaboration between the European Southern Observatory (ESO) and the Observatoire de la Cote d'Azur (OCA). It has been established to determine the stellar atmospheric parameters (effective temperature, surface gravity, global metallicities and abundance of alpha-elements over iron) of the archived spectra of four ESO spectrographs. The analysis of the ESO:HARPS archived spectra is presented. The sample being analysed (AMBRE:HARPS) covers the period from 2003 to 2010 and is comprised of 126688 scientific spectra corresponding to 17218 different stars. For the analysis of the spectral sample, the automated pipeline developed for the analysis of the AMBRE:FEROS archived spectra has been adapted to the characteristics of the HARPS spectra. Within the pipeline, the stellar parameters are determined by the MATISSE algorithm, developed at OCA for the analysis of large samples of stellar spectra in the framework of galactic archaeology. In the present application, MATISSE uses the AMBRE grid of synthetic spectra, which covers FGKM-type stars for a range of gravities and metallicities. We first determined the radial velocity and its associated error for the ~15% of the AMBRE:HARPS spectra, for which this velocity had not been derived by the ESO:HARPS reduction pipeline. The stellar atmospheric parameters and the associated chemical index [alpha/Fe] with their associated errors have then been estimated for all the spectra of the AMBRE:HARPS archived sample. Based on quality criteria, we accepted and delivered the parameterisation of ~71% of the total sample to ESO. These spectra correspond to ~10706 stars; each are observed between one and several hundred times. This automatic parameterisation of the AMBRE:HARPS spectra shows that the large majority of these stars are cool main-sequence dwarfs with metallicities greater than -0.5 dex.

References in corpus (4)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
• Automated derivation of stellar atmospheric parameters and chemical abundances: the MATISSE algorithm
• Stellar characterization of CoRoT/Exoplanet fields with MATISSE

Cited by in corpus (22)

• Stellar chromospheric activity of 1,674 FGK stars from the AMBRE-HARPS sample I. A catalogue of homogeneous chromospheric activity
• The AMBRE Project: chemical evolution models for the Milky Way thick and thin discs
• The AMBRE project: The thick thin disk and thin thick disk of the Milky Way
• Empirical photometric calibration of the Gaia Red Clump: colours, effective temperature and absolute magnitude
• The AMBRE Project: Constraining the lithium evolution in the Milky Way
• The Gaia-ESO Survey: calibration strategy
• Unveiling the time evolution of chemical abundances across the Milky Way disk with APOGEE
• To use or not to use synthetic stellar spectra in population synthesis models?
• The AMBRE project: a study of Li evolution in the Galactic thin and thick discs
• Explaining the decrease in ISM lithium at super-solar metallicities in the solar vicinity
• [Mg/Fe] ratios in the solar neighbourhood: stellar yields and chemical evolution scenarios
• The AMBRE Project: Origin and evolution of sulfur in the Milky Way
• The GALAH Survey: Temporal Chemical Enrichment of the Galactic Disk
• The AMBRE Project: Spectrum normalisation influence on Mg abundances in the metal-rich Galactic disc
• New Generation Stellar Spectral Libraries in the Optical and Near-Infrared I: The Recalibrated UVES-POP Library for Stellar Population Synthesis
• The AMBRE Project: Solar neighbourhood chemodynamical constraints on Galactic disc evolution
• Evidence of extra-mixing in field giants as traced by lithium and carbon isotope ratio
• Spectroscopy of Dwarf Stars Around the North Celestial Pole
• Stellar twins determine the distance of the Pleiades
• EMISSA -- Exploring Millimetre Indicators of Solar-Stellar Activity II. Towards a robust indicator of stellar activity
• Chemical characterisation of the X-shooter Spectral Library (XSL): [Mg/Fe] and [Ca/Fe] abundances
• The AMBRE Project: Line-broadening and stellar rotation of ESO/FEROS archived spectra