The Gaia-ESO Survey: a new approach to chemically characterising young open clusters

Abstract

Open clusters (OCs) are recognised as excellent tracers of Galactic thin-disc properties. At variance with intermediate-age and old OCs, for which a significant number of studies is now available, clusters younger than 150 Myr have been mostly overlooked in terms of their chemical composition, with few exceptions. On the other hand, previous investigations seem to indicate an anomalous behaviour of young clusters, which includes slightly sub-solar iron (Fe) abundances and extreme, unexpectedly high barium (Ba) enhancements. In a series of papers, we plan to expand our understanding of this topic and investigate whether these chemical peculiarities are instead related to abundance analysis techniques. We present a new determination of the atmospheric parameters for 23 dwarf stars observed by the Gaia-ESO survey in five young OCs (younger than 150 Myr) and one star-forming region (NGC 2264). We exploit a new method based on titanium (Ti) lines to derive the spectroscopic surface gravity, and most importantly, the microturbulence parameter. A combination of Ti I and Fe I lines is used to obtain effective temperatures. We also infer the abundances of Fe II, Ti II, Na I, Mg I, Al I, Si I, Ca I, Cr I and Ni I. Our findings are in fair agreement with Gaia-ESO iDR5 results for effective temperatures and surface gravities, but suggest that for very young stars, the microturbulence parameter is over-estimated when Fe lines are employed. This affects the derived chemical composition and causes the metal content of very young clusters to be under-estimated. Our clusters display a metallicity [Fe/H] between +0.04 and +0.12; they are not more metal poor than the Sun. Although based on a relatively small sample size, our explorative study suggests that we may not need to call for ad hoc explanations to reconcile the chemical composition of young OCs with Galactic chemical evolution models.

16 pages, 11 figures, accepted by A&A

References in corpus (26)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
• ARES v2 - new features and improved performance
• The Gaia FGK Benchmark Stars - High resolution spectral library
• Abundance to age ratios in the HARPS-GTO sample with Gaia DR2: Chemical clocks for a range of [Fe/H]
• A maximum likelihood method for fitting colour-magnitude diagrams
• Enhanced production of barium in low-mass stars: evidence from open clusters
• 18 Sco: a solar twin rich in refractory and neutron-capture elements. Implications for chemical tagging
• The Gaia-ESO Survey: processing of the FLAMES-UVES spectra
• New insights on Ba over-abundance in open clusters. Evidence for the intermediate neutron-capture process at play?
• Open clusters in APOGEE and GALAH: Combining Gaia and ground-based spectroscopic surveys
• The evolution of the Milky Way: New insights from open clusters
• Dawes Review. The tidal downsizing hypothesis of planet formation
• Zirconium, Barium, Lanthanum and Europium Abundances in Open Clusters
• The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264
• The effect of stellar activity on the spectroscopic stellar parameters of the young solar twin HIP 36515
• A critical reassessment of the fundamental properties of GJ 504: Chemical composition and age
• Gaia-ESO Survey: The analysis of pre-main sequence stellar spectra
• The Gaia-ESO Survey: A new approach to chemically characterising young open clusters II. Abundances of the neutron-capture elements Cu, Sr, Y, Zr, Ba, La, and Ce
• The Gaia-ESO Survey: metallicity of the Chamaeleon I star forming region
• Solar twins and the Barium puzzle
• The Gaia-ESO Survey: the first abundance determination of the pre-main-sequence cluster Gamma Velorum
• First determination of s-process element abundances in pre-main sequence clusters: Y, Zr, La, and Ce in IC 2391, the Argus association and IC 2602
• On the iron ionization balance of cool stars
• Formation depths of Fraunhofer lines

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