Gaia-ESO Survey: The analysis of pre-main sequence stellar spectra

Abstract

This paper describes the analysis of UVES and GIRAFFE spectra acquired by the Gaia-ESO Public Spectroscopic Survey in the fields of young clusters whose population includes pre-main sequence (PMS) stars. Both methods that have been extensively used in the past and new ones developed in the contest of the Gaia-ESO survey enterprise are available and used. The internal precision of these quantities is estimated by inter-comparing the results obtained by such different methods, while the accuracy is estimated by comparison with independent external data, like effective temperature and surface gravity derived from angular diameter measurements, on a sample of benchmarks stars. Specific strategies are implemented to deal with fast rotation, accretion signatures, chromospheric activity, and veiling. The analysis carried out on spectra acquired in young clusters' fields during the first 18 months of observations, up to June 2013, is presented in preparation of the first release of advanced data products. Stellar parameters obtained with the higher resolution and larger wavelength coverage from UVES are reproduced with comparable accuracy and precision using the smaller wavelength range and lower resolution of the GIRAFFE setup adopted for young stars, which allows us to provide with confidence stellar parameters for the much larger GIRAFFE sample. Precisions are estimated to be $\approx$ 120 K r.m.s. in Teff, $\approx$0.3 dex r.m.s. in logg, and $\approx$0.15 dex r.m.s. in [Fe/H], for both the UVES and GIRAFFE setups.

arXiv comment22 pages, 18 figures, accepted for publication on A&A

References in corpus (44)

• 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
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• Very Low Mass Stars and Brown Dwarfs in Taurus-Auriga
• A database of high and medium-resolution stellar spectra
• Accretion in Brown Dwarfs: an Infrared View
• X-Shooter spectroscopy of young stellar objects: IV -- Accretion in low-mass stars and sub-stellar objects in Lupus
• UV excess measures of accretion onto young very low-mass stars and brown dwarfs
• Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs
• A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
• Gaia FGK Benchmark Stars - Metallicity
• Time scales of Li evolution: a homogeneous analysis of open clusters from ZAMS to late-MS
• Measuring Accretion in Young Substellar Objects: Approaching the Planetary Mass Regime
• The stellar association around Gamma Velorum and its relationship with Vela OB2
• The PASTEL catalogue of stellar parameters
• DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
• A Spitzer view of protoplanetary disks in the gamma Velorum cluster
• Pre-main-sequence isochrones -- II. Revising star and planet formation timescales
• An empirical criterion to classify T Tauri stars and substellar analogs using low-resolution optical spectroscopy
• Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
• Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars
• Data analysis recipes: Fitting a model to data
• Chemical abundances of 451 stars from the HARPS GTO planet search program: Thin disc, thick disc, and planets
• Near and Mid-IR Photometry of the Pleiades, and a New List of Substellar Candidate Members
• The Gaia-ESO Survey: Kinematic structure in the Gamma Velorum Cluster
• The Lithium Depletion Boundary in NGC 2547 as a test of pre-main-sequence evolutionary models
• The Gaia-ESO Survey: Chromospheric Emission, Accretion Properties, and Rotation in $\gamma$ Velorum and Chamaeleon I
• The Gaia-ESO Survey: processing of the FLAMES-UVES spectra
• The Gaia-ESO Survey: Stellar content and elemental abundances in the massive cluster NGC 6705
• LAMP: The Long-term Accretion Monitoring Program of T Tauri stars in Chamaeleon-I
• The discovery of a low mass, pre-main-sequence stellar association around gamma Velorum
• Chemically tagging the Hyades Supercluster: A homogeneous sample of F6-K4 kinematically selected northern stars
• Pre-main-sequence isochrones -- I. The Pleiades benchmark
• The Gaia-ESO Survey: Discovery of a spatially extended low-mass population in the Vela OB2 association
• FAMA: An automatic code for stellar parameter and abundance determination
• Basal Chromospheric Flux and Maunder Minimum-type Stars: The quiet-Sun Chromosphere as a Universal Phenomenon
• The Gaia-ESO Survey: metallicity of the Chamaeleon I star forming region
• Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440-6810 A in the gamma Vel cluster, and calibration of spectral indices
• Tool for Automatic Measurement of Equivalent width (TAME)
• DOOp, an automated wrapper for DAOSPEC
• The Gaia-ESO Survey: the first abundance determination of the pre-main-sequence cluster Gamma Velorum
• A new procedure for defining a homogenous line-list for solar-type stars
• Spectroscopic observations of blue stars with infrared excesses in NGC 6611

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• The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. I. Cluster age range and initial membership selections
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• Gaia-ESO Survey: global properties of clusters Trumpler 14 and 16 in the Carina Nebula
• The Gaia-ESO Survey: Lithium measurements and new curves of growth
• The Gaia-ESO Survey: Catalogue of H$\alpha$ emission stars
• The Gaia-ESO Survey: The analysis of the hot-star spectra
• The Gaia-ESO Survey: Preparing the ground for 4MOST & WEAVE galactic surveys. Chemical evolution of lithium with machine learning
• The first spectroscopically confirmed brown dwarfs in NGC 2264