Mass and Age of Red Giant Branch Stars Observed with LAMOST and \emph{Kepler}

Abstract

Obtaining accurate and precise masses and ages for large numbers of giant stars is of great importance for unraveling the assemblage history of the Galaxy. In this paper, we estimate masses and ages of 6940 red giant branch (RGB) stars with asteroseismic parameters deduced from \emph{Kepler} photometry and stellar atmospheric parameters derived from LAMOST spectra. The typical uncertainties of mass is a few per cent, and that of age is $\sim$\,20 per cent. The sample stars reveal two separate sequences in the age -- [$\alpha$/Fe] relation -- a high--$\alpha$ sequence with stars older than $\sim$\,8\,Gyr and a low--$\alpha$ sequence composed of stars with ages ranging from younger than 1\,Gyr to older than 11\,Gyr. We further investigate the feasibility of deducing ages and masses directly from LAMOST spectra with a machine learning method based on kernel based principal component analysis, taking a sub-sample of these RGB stars as a training data set. We demonstrate that ages thus derived achieve an accuracy of $\sim$\,24 per cent. We also explored the feasibility of estimating ages and masses based on the spectroscopically measured carbon and nitrogen abundances. The results are quite satisfactory and significantly improved compared to the previous studies.

arXiv commentaccepted by MNRAS

References in corpus (55)

• Planck 2015 results. XIII. Cosmological parameters
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Dartmouth Stellar Evolution Database
• The K2 Mission: Characterization and Early results
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• Chemical evolution with radial mixing
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
• The Ages of Stars
• The age structure of stellar populations in the solar vicinity. Clues of a two-phase formation history of the Milky Way disk
• Asteroseismology of Solar-Type and Red-Giant Stars
• Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• The Cannon: A data-driven approach to stellar label determination
• Asteroseismic fundamental properties of solar-type stars observed by the NASA Kepler Mission
• Structure and Evolution of Nearby Stars with Planets II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
• Calculating asteroseismic diagrams for solar-like oscillations
• Red giant masses and ages derived from carbon and nitrogen abundances
• Asteroseismic classification of stellar populations among 13000 red giants observed by Kepler
• The Genesis of the Milky Way's Thick Disk via Stellar Migration
• Solar-like oscillations in low-luminosity red giants: first results from Kepler
• Red-giant seismic properties analyzed with CoRoT
• The underlying physical meaning of the ${\nu }_{\max }-{\nu }_{\mathrm{c}}$ relation
• Mixed modes in red giants: a window on stellar evolution
• Spectroscopic determination of masses (and implied ages) for red giants
• Stellar population synthesis based modelling of the Milky Way using asteroseismology of 13000 Kepler red giants
• The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk
• Testing the asteroseismic scaling relations for Red Giants with Eclipsing Binaries Observed by Kepler
• Young [$\alpha$/Fe]-enhanced stars discovered by CoRoT and APOGEE: What is their origin?
• Period spacings in red giants II. Automated measurement
• Characteristics of solar-like oscillations in red giants observed in the CoRoT exoplanet field
• Carbon, nitrogen and $\alpha$-element abundances determine the formation sequence of the Galactic thick and thin disks
• The LAMOST Stellar Parameter Pipeline at Peking University --- LSP3
• LAMOST observations in the Kepler field. Database of low-resolution spectra
• An in-depth study of grid-based asteroseismic analysis
• Characterisation of red-giant stars in the public Kepler data
• Oscillating red giants observed during Campaign 1 of the Kepler K2 mission: New prospects for galactic archaeology
• Estimating stellar atmospheric parameters, absolute magnitudes and elemental abundances from the LAMOST spectra with Kernel-based Principal Component Analysis
• Cannibals in the thick disk: the young $\alpha -$rich stars as evolved blue stragglers
• Significantly improving stellar mass and radius estimates: A new reference function for the Δν scaling relation
• LAMOST Spectroscopic Survey of the Galactic Anticentre (LSS-GAC): the second release of value-added catalogues
• Empirical metallicity-dependent calibrations of effective temperature against colours for dwarfs and giants based on interferometric data
• Changing the ${\nu }_{\max }$ Scaling Relation: The Need For a Mean Molecular Weight Term
• The K2 Galactic Archaeology Program Data Release 1: Asteroseismic results from Campaign 1
• Deep Learning Classification in Asteroseismology
• Ages and masses of million Galactic disk main sequence turn-off and sub-giant stars from the LAMOST Galactic spectroscopic surveys
• Masses and Ages for 230,000 LAMOST Giants, via Their Carbon and Nitrogen Abundances
• A New Method for the Asteroseismic Determination of the Evolutionary State of Red-Giant Stars
• Probing the deep end of the Milky Way with \emph{Kepler}: Asteroseismic analysis of 854 faint Red Giants misclassified as Cool Dwarfs
• Asteroseismology of 1523 misclassified red giants using $\text{Kepler}$ data
• On the LSP3 estimates of surface gravity for LAMOST-Kepler stars with asteroseismic measurements
• Spindown of magnetars: Quantum Vacuum Friction?

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• Isochrone ages for ~3 million stars with the second Gaia data release
• Abundance to age ratios in the HARPS-GTO sample with Gaia DR2: Chemical clocks for a range of [Fe/H]
• Overview of the LAMOST survey in the first decade
• Age-resolved chemistry of red giants in the solar neighbourhood
• Spatial variations in the Milky Way disc metallicity-age relation
• Stellar Initial Mass Function Varies with Metallicities and Time
• Spectroscopic age estimates for APOGEE red-giant stars: Precise spatial and kinematic trends with age in the Galactic disc
• The age-chemical abundance structure of the Galactic disc II: $\alpha$-dichotomy and thick disc formation
• Stellar mass distribution and star formation history of the Galactic disk revealed by mono-age stellar populations from LAMOST
• Mapping the Galactic disk with the LAMOST and Gaia Red clump sample: I: precise distances, masses, ages and 3D velocities of $\sim$ 140000 red clump stars
• Ages and Masses of 0.64 million Red Giant Branch stars from the LAMOST Galactic Spectroscopic Survey
• Age-chemical abundance structure of the Galaxy I: Evidence for a late accretion event in the outer disc at z ~ 0.6
• Quantifying radial migration in the Milky Way: Inefficient over short timescales but essential to the very outer disc beyond ~15 kpc
• Planets Across Space and Time (PAST). I. Characterizing the Memberships of Galactic Components and Stellar Ages: Revisiting the Kinematic Methods and Applying to Planet Host Stars
• Mapping the Galactic disk with the LAMOST and Gaia Red clump sample. II. 3D asymmetrical kinematics of mono-age populations in the disk between 6$-14$ \,kpc
• Overview of the LAMOST-$Kepler$ project
• Most "young" $\alpha$-rich stars have high masses but are actually old
• Star Formation Timescales of the Halo Populations from Asteroseismology and Chemical Abundances
• The GALAH Survey: Temporal Chemical Enrichment of the Galactic Disk
• On the Identification of Wide Binaries in the Kepler Field
• Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia
• Precise Masses, Ages of ~1.0 million RGB and RC stars observed by the LAMOST
• Identification, mass and age of primary red clump stars from spectral features derived with the LAMOST DR7
• Evidence that Mass Loss on the Red Giant Branch Decreases with Metallicity
• S-type stars discovered in Medium-Resolution Spectra of LAMOST DR9
• Weighing stars from birth to death: mass determination methods across the HRD
• Study on Outliers in the Big Stellar Spectral Dataset of the Fifth Data Release (DR5) of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)
• FRA -- A new Fast, Robust and Automated pipeline for the detection and measurement of solar-like oscillations in time-series photometry of red-giant stars
• Exploring the History of Stellar Mergers with Chemistry: Examining the Origins of Massive $\alpha$-Enriched Stars using Carbon Isotope Ratios