Dissecting the Gaia HR diagram within 200 pc

Abstract

We analyse the high-quality Hertzsprung-Russell diagram (HRD) derived from Gaia data release 2 for the Solar Neighbourhood. We start building an almost-complete sample within 200 pc and for |b|>25 deg, so as to limit the impact of known errors and artefacts in the Gaia catalog. Particular effort is then put into improving the modelling of population of binaries, which produce two marked features in the HRD: the sequence of near-equal mass binaries along the lower main sequence, and the isolated group of hot subdwarfs. We describe a new tool, BinaPSE, to follow the evolution of interacting binaries in a way that improves the consistency with PARSEC evolutionary tracks for single stars. BinaPSE is implemented into the TRILEGAL code for the generation of "partial models" for both single and binary stellar populations, taking into account the presence of resolved and unresolved binaries. We then fit the Gaia HRD via MCMC methods that search for the star formation history (SFH) and initial binary fraction (by mass) that maximise the likelihood. The main results are (i) the binary fraction derived from the lower main sequence is close to 0.4, while twice larger values are favoured when the upper part of the HRD is fitted; (ii) present models predict the observed numbers of hot subdwarfs to within a factor of 2; (iii) irrespective of the prescription for the binaries, the star formation rate peaks at values 1.5e-4 Msun/yr at ages slightly above 2 Gyr, and then decreases to 0.8e-4 Msun/yr at very old ages.

arXiv commentresubmitted to MNRAS after final minor changes requested by referee

References in corpus (74)

• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• Evolution of binary stars and the effect of tides on binary populations
• Gaia Data Release 2: The astrometric solution
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• Comprehensive analytic formulae for stellar evolution as a function of mass and metallicity
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• The Origin of Subdwarf B Star (I): the Formation Channels
• Gaia Data Release 2: Photometric content and validation
• Gaia Data Release 2: using Gaia parallaxes
• The origin of sdB stars (II)
• Astrophysical parameters of Galactic open clusters
• PARSEC evolutionary tracks of massive stars up to $350M_{\odot }$ at metallicities 0.0001$\le Z\le$0.04
• Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
• Numerical Methods of Star Formation History Measurement and Applications to Seven Dwarf Spheroidals
• The age structure of stellar populations in the solar vicinity. Clues of a two-phase formation history of the Milky Way disk
• New Grids of ATLAS9 Model Atmospheres
• Post-Asymptotic Giant Branch Evolution of Low- and Intermediate-Mass Stars. Preliminary Results
• New models for the evolution of Post-Asymptotic Giant Branch stars and Central Stars of Planetary Nebulae
• The ACS Nearby Galaxy Survey Treasury VIII. The Global Star Formation Histories of 60 Dwarf Galaxies in the Local Volume
• Data analysis recipes: Using Markov Chain Monte Carlo
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars I. The COLIBRI Code
• Updated parameters of 1743 open clusters based on Gaia DR2
• The birth of the Milky Way as uncovered by accurate stellar ages with Gaia
• Age determination for 269 $Gaia$ DR2 Open Clusters
• New cooling sequences for old white dwarfs
• The Evolution of Massive Helium Stars Including Mass Loss
• 3D maps of interstellar dust in the Local Arm: using $Gaia$, 2MASS and APOGEE-DR14
• The fraction of binary systems in the core of thirteen low-density Galactic globular clusters
• The metallicity distribution of G dwarfs in the solar neighbourhood
• A reanalysis of the Gaia Data Release 2 photometric sensitivity curves using HST/STIS spectrophotometry
• The ACS LCID Project: On the origin of dwarf galaxy types: a manifestation of the halo assembly bias?
• YBC, a stellar bolometric corrections database with variable extinction coefficients: an application to PARSEC isochrones
• The Panchromatic Hubble Andromeda Treasury XI: The Spatially-Resolved Recent Star Formation History of M31
• Atmospheres from very low-mass stars to extrasolar planets
• Discovery of an equal-mass "twin" binary population reaching 1000+ AU separations
• The population of hot subdwarf stars studied with Gaia II. The Gaia DR2 catalogue of hot subluminous stars
• The VMC survey - XXXI. The spatially resolved star formation history of the main body of the Small Magellanic Cloud
• A revision of the solar neighbourhood metallicity distribution
• Gaia DR2 reveals a star formation burst in the disc 2-3 Gyr ago
• SDSS-V: Pioneering Panoptic Spectroscopy
• Measuring the Recoverability of Close Binaries in Gaia DR2 with the Robo-AO Kepler Survey
• Recovering the star formation rate in the solar neighborhood
• The recent star formation history of the Hipparcos solar neighbourhood
• Mixing by overshooting and rotation in intermediate mass stars
• Revised Gaia Data Release 2 passbands
• Spatial variations in the Milky Way disc metallicity-age relation
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars V: Constraining the Mass Loss and Lifetimes of Intermediate Mass, Low Metallicity AGB Stars
• New PARSEC database of alpha-enhanced stellar evolutionary tracks and isochrones I. Calibration with 47 Tuc (NGC104) and the improvement on RGB bump
• K dwarfs and the chemical evolution of the Solar cylinder
• The SUPERWIDE Catalog: A Catalog of 99,203 Wide Binaries Found in Gaia and Supplemented by the SUPERBLINK High Proper Motion Catalog
• Supernovae Ib and Ic from the explosion of helium stars
• Determining Ages of APOGEE Giants with Known Distances
• Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior
• The Star Formation History of the Solar Neighbourhood from the White Dwarf Luminosity Function
• A catalog of wide binary and multiple systems of bright stars from Gaia-DR2 and the Virtual Observatory
• New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field
• The Gaia DR2 parallax zero point: Hierarchical modeling of red clump stars
• Contrast sensitivities in the Gaia Data Release 2
• Multiple stellar populations in NGC 1866. New clues from Cepheids and Colour-Magnitude Diagram
• The stellar Initial Mass Function of the solar neighbourhood revealed by Gaia
• ESO Imaging Survey. The Stellar Catalogue in the Chandra Deep Field South
• An inverse method to interpret colour-magnitude diagrams
• Star formation history of the solar neighbourhood as told by Gaia
• A bottom-heavy initial mass function for the likely-accreted blue-halo stars of the Milky Way
• The GALAH Survey: Temporal Chemical Enrichment of the Galactic Disk
• Three-Dimensional Structure and Dust Extinction in the Small Magellanic Cloud
• Uncertainties in stellar evolution models: convective overshoot
• A revisited study of Cepheids in open clusters in the Gaia era

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• DUETS: Setting expectations for asteroseismic binaries and binary products with synthetic populations
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