Stellar Population Astrophysics (SPA) with the TNG. alpha-elements, lithium, sodium and aluminum in 16 open clusters

Abstract

Exploring the Galactic chemical evolution and enrichment scenarios with open clusters allows us to understand the history of the Milky Way disk. High-resolution spectra of OCs are a crucial tool, as they provide precise chemical information, to combine with precise distances and ages. The aim of the Stellar Population Astrophysics project is to derive homogeneous and accurate comprehensive chemical characterization of a number of poorly studied OCs.Using the HARPS-N echelle spectrograph at the Telescopio Nazionale Galileo, we obtained high-resolution spectra of giant stars in 18 OCs, 16 of which are chemically characterized for the first time, and two of which are well studied for comparison. The OCs in this sample have ages from a few tens of Myr to 4 Gyr, with a prevalence of young clusters. We already presented the radial velocities and atmospheric parameters for them in a previous SPA paper. Here, we present results for the alpha-elements O, and the light elements, all determined by the equivalent width method. We also measured Li abundance through the synthesis method.We discuss the behaviors of lithium, sodium and aluminum in the context of stellar evolution. We study the radial, vertical, and age trends for the measured abundance ratios in a sample that combines our results and recent literature for OCs, finding significant gradients only for [Mg/Fe] and [Ca/Fe] in all cases. Finally,we compare O and Mg in the combined sample with chemo-dynamical models, finding a good agreement for intermediate-age and old clusters. There is a sharp increase in the abundance ratios measured among very young clusters, accompanied by a poorer fit with the models for O and Mg, likely related to the inadequacy of traditional model atmospheres and methods in the derivation of atmospheric parameters and abundance ratios for stars of such young ages

References in corpus (68)

• The chemical composition of the Sun
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• Painting a portrait of the Galactic disc with its stellar clusters
• Chemodynamical evolution of the Milky Way disk I: The solar vicinity
• Non-LTE calculations for neutral Na in late-type stars using improved atomic data
• Yields of AGB and SAGB models with chemistry of low- and high-metallicity Globular Clusters
• Thermohaline instability and rotation-induced mixing. III - Grid of stellar models and asymptotic asteroseismic quantities from the pre-main sequence up to the AGB for low- and intermediate-mass stars at various metallicities
• The photospheric solar oxygen project: I. Abundance analysis of atomic lines and influence of atmospheric models
• Age determination for 269 $Gaia$ DR2 Open Clusters
• Chemodynamical evolution of the Milky Way disk II: Variations with Galactic radius and height above the disk plane
• Gaia Radial Velocity Spectrometer
• ARES v2 - new features and improved performance
• Untangling the Galaxy I: Local Structure and Star Formation History of the Milky Way
• Hunting for open clusters in \textit{Gaia} DR2: $582$ new OCs in the Galactic disc
• Estimating stellar birth radii and the time evolution of the Milky Way's ISM metallicity gradient
• The evolution of the Galactic metallicity gradient from high-resolution spectroscopy of open clusters
• The Gaia-ESO Public Spectroscopic Survey: Implementation, data products, open cluster survey, science, and legacy
• Constraining the thermally pulsing asymptotic giant branch phase with resolved stellar populations in the Large Magellanic Cloud
• Elemental Abundance Ratios in Stars of the Outer Galactic Disk. IV. A New Sample of Open Clusters
• The Open Cluster Chemical Abundances and Mapping Survey: IV. Abundances for 128 Open Clusters using SDSS/APOGEE DR16
• Gaia Data Release 2: Processing the spectroscopic data
• Non-LTE aluminium abundances in late-type stars
• Chemical Cartography with APOGEE: Multi-element abundance ratios
• Abundance to age ratios in the HARPS-GTO sample with Gaia DR2: Chemical clocks for a range of [Fe/H]
• Hunting for open clusters in \textit{Gaia} DR2: the Galactic anticentre
• A Chemical Abundance Study of 10 Open Clusters Based on WIYN-Hydra Spectroscopy
• The Bologna Open Cluster Chemical Evolution (BOCCE) Project: midterm results from the photometric sample
• Hunting for open clusters in Gaia EDR3: $628$ new open clusters found with OCfinder
• The GALAH survey: tracing the Galactic disk with Open Clusters
• Chemical Enrichment and Radial Migration in the Galactic Disk -- the origin of the [$\alpha /\mathrm{Fe}]$ Double Sequence
• Chemical Abundances of the Milky Way Thick Disk and Stellar Halo I.: Implications of [alpha/Fe] for Star Formation Histories in Their Progenitors
• The Gaia-ESO Survey: Sodium and aluminium abundances in giants and dwarfs - Implications for stellar and Galactic chemical evolution
• Characterising Open Clusters in the solar neighbourhood with the Tycho-Gaia Astrometric Solution
• Chemical gradients in the Milky Way from the RAVE data. II. Giant stars
• How magnetic activity alters what we learn from stellar spectra
• Mapping the Galactic Metallicity Gradient with Open Clusters: The State-of-the-Art and Future Challenges
• The Gaia-ESO survey: Calibrating a relationship between Age and the [C/N] abundance ratio with open clusters
• Abundances in the Local Region I: G and K Giants
• Exploring open cluster properties with Gaia and LAMOST
• The Gaia-ESO Survey: Membership probabilities for stars in 63 open and 7 globular clusters from 3D kinematics
• Lithium in M67: From the main sequence to the red giant branch
• The GALAH Survey: Verifying abundance trends in the open cluster M67 using non-LTE spectroscopy
• The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
• The Gaia-ESO Survey: the origin and evolution of s-process elements
• The Gaia-ESO survey: Mixing processes in low-mass stars traced by lithium abundance in cluster and field stars
• The effect of stellar activity on the spectroscopic stellar parameters of the young solar twin HIP 36515
• A catalogue of 74 new open clusters found in Gaia Data-Release 2
• Lithium abundances in globular cluster giants: NGC 1904, NGC 2808, and NGC 362
• OCCASO III. Iron peak and $\alpha$ elements of 18 open clusters. Comparison with chemical evolution models and field stars
• Searching for Li-rich giants in a sample of 12 open clusters: Li enhancement in two stars with substellar companions
• The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. I. Cluster age range and initial membership selections
• Mapping the Galactic disk with the LAMOST and $Gaia$ Red clump sample: V: On the origin of the "young" [$\alpha$/Fe]-enhanced stars
• Stellar population astrophysics (SPA) with the TNG. Revisiting the metallicity of Praesepe (M44)
• The distribution of [$\alpha$/Fe] in the Milky Way disc
• Stellar Population Astrophysics (SPA) with TNG Atmospheric parameters of members of 16 unstudied open clusters
• Stellar Population Astrophysics (SPA) with TNG. The old open clusters Collinder 350, Gulliver 51, NGC 7044, and Ruprecht 171
• The photospheric solar oxygen project: II. Non-concordance of the oxygen abundance derived from two forbidden lines
• The Gaia-ESO survey: Lithium abundances in open cluster Red Clump stars
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• On the sodium overabundance of giants in open clusters: The case of the Hyades
• Deep secrets of intermediate-mass giants and supergiants: Models with rotation seem to overestimate mixing effects on the surface abundances of C, N, and Na
• Stellar Population Astrophysics (SPA) with the TNG: Stock 2, a little-studied open cluster with an eMSTO
• OCCASO IV. Radial Velocities and Open Cluster Kinematics
• One Star to Tag Them All (OSTTA): I. Radial velocities and chemical abundances for 20 poorly studied open clusters
• Li abundances for solar twins in the open cluster M67
• Radial velocity and chemical composition of evolved stars in the open clusters NGC 6940 and Tombaugh 5

Cited by in corpus (3)

• The Radcliffe Wave as traced by young open clusters: Stellar parameters, activity indicators, and abundances of solar-type members of eight young clusters
• Stellar Population Astrophysics (SPA) with the TNG: NLTE atmospheric parameters and abundances of giant stars in 33 Open Clusters
• The GALAH survey: Improving chemical abundances using star clusters