New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey

Abstract

We present a re-analysis of the Geneva-Copenhagen survey, which benefits from the infrared flux method to improve the accuracy of the derived stellar effective temperatures and uses the latter to build a consistent and improved metallicity scale. Metallicities are calibrated on high-resolution spectroscopy and checked against four open clusters and a moving group, showing excellent consistency. The new temperature and metallicity scales provide a better match to theoretical isochrones, which are used for a Bayesian analysis of stellar ages. With respect to previous analyses, our stars are on average 100 K hotter and 0.1 dex more metal rich, which shift the peak of the metallicity distribution function around the solar value. From Stromgren photometry we are able to derive for the first time a proxy for alpha elements, which enables us to perform a tentative dissection of the chemical thin and thick disc. We find evidence for the latter being composed of an old, mildly but systematically alpha-enhanced population that extends to super solar metallicities, in agreement with spectroscopic studies. Our revision offers the largest existing kinematically unbiased sample of the solar neighbourhood that contains full information on kinematics, metallicities, and ages and thus provides better constraints on the physical processes relevant in the build-up of the Milky Way disc, enabling a better understanding of the Sun in a Galactic context.

Minor changes to match published version. Higher resolution figures and data available at http://www.mpa-garching.mpg.de/~luca/GCS

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• Long-period double-lined eclipsing binaries: the system V454 Aur with the secondary eclipse caused by the occultation of the hotter component
• Investigating the vertical distribution of the disk as a function of radial action: Results from simulations
• Precise Masses and Orbits for Nine Radial Velocity Exoplanets
• First large scale spatial and velocity patterns of local metal-rich stars in the Milky Way
• Cosmic Radioactivity and Galactic Chemical Evolution
• The survey of Planetary Nebulae in Andromeda (M31): I. Imaging the disk and halo with MegaCam@CFHT
• Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903
• Revisiting the Galactic age-metallicity relation from wide white dwarf-main-sequence binaries
• A.C.I.D -- An Improved LSD Technique for Accurate Line Profile Retrieval
• Stellar age determination using deep neural networks: Isochrone ages for 1.3 million stars, based on BaSTI, MIST, PARSEC, Dartmouth and SYCLIST evolutionary grids
• Apache Point Observatory follow-up of ACcelerating Candidate ExopLanet host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere
• The odd bunch: chrono-chemo-dynamics of sixteen unusual stars from Kepler
• Identification of additional young nearby runaway stars based on Gaia data release 2 observations and the lithium test
• Chemical Abundance Analysis of Moving Group W11450 (Latham 1)
• CoronaGraph Instrument Reference stars for Exoplanets (CorGI-REx) I. Preliminary Vetting and Implications for the Roman Coronagraph and Habitable Worlds Observatory
• 3D elemental abundances of stars at formation across the histories of Milky Way-mass galaxies in the FIRE simulations
• The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission
• The SOL $\text{(Solar Origin and Life)}$ Project: Detailed characterization of candidates for the ZAMS and Subgiant stages
• Two sequences in the age-metallicity relation as seen from [C/N] abundances in APOGEE
• Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project
• A Theoretical Study of the Structure and Elemental Abundances of HD 20794
• Wrinkles in Time. II. Stellar Age Trends in Kinematic Signatures from Transient Spiral Structure