Chemical Properties of the Local Disk and Halo. II. Abundances of 3745 M dwarfs and Subdwarfs from Improved Model Fitting of Low-Resolution Spectra

Abstract

We present a model-fit pipeline to determine the stellar parameters of M-type dwarfs, which is an improvement upon our previous work described in Hejazi et al. 2020. We apply this pipeline to analyze the low-resolution (R~2000) spectra of 3745 M dwarfs/subdwarfs, collected at the MDM Observatory, Lick Observatory, Kitt Peak National Observatory, and Cerro Tololo Interamerican Observatory. We examine the variation of the inferred parameter values in the HR diagram constructed from their Gaia Early Data Release 3 (EDR3) parallaxes and optical magnitudes. We also study the distribution of our stars in the abundance diagram of [alpha/Fe] versus [M/H] and inspect the variation of their metallicity class, effective temperature, and surface gravity as well as their Galactic velocity components U, V, and W in this diagram. In addition, the analyses of the stars' projected motions in the two-dimensional UV, VW, and UW planes and the variation of their chemical parameters in these planes, and also their distribution in the abundance-velocity diagrams are important parts of this study. The precision of our model-fit pipeline is confirmed by the clear stratification of effective temperature and chemical parameters in the HR diagram, the similarity of the stars' distribution in the [alpha/Fe] versus [M/H] diagram and in the metallicity-velocity planes with those from other studies, revealing substructure in the abundance-velocity diagrams, and chemical homogeneity between the components of a set of binary systems.

arXiv comment49 pages, Accepted to ApJ

References in corpus (62)

• Gaia Data Release 2. Summary of the contents and survey properties
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Local Kinematics and the Local Standard of Rest
• The Dartmouth Stellar Evolution Database
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• Abundance Gradients and the Formation of the Milky Way
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• The GALAH+ Survey: Third Data Release
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• Model Atmospheres for M (Sub)Dwarfs: I. The base model grid
• Nominal values for selected solar and planetary quantities: IAU 2015 Resolution B3
• A Catalog of Northern Stars With Annual Proper Motions Larger Than 0.15 Seconds of Arc (LSPM catalog - North)
• Unresolved stellar companions with Gaia DR2 astrometry
• The Luminosity and Mass Functions of Low-Mass Stars in the Galactic Disk: II. The Field
• How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70$M_{\odot }$
• The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog I: Data
• The Formation of Low-Mass Binary Star Systems Via Turbulent Fragmentation
• A Spectroscopic Catalog of the Brightest (J<9) M Dwarfs in the Northern Sky
• Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
• SOAR TESS Survey. I: Sculpting of TESS planetary systems by stellar companions
• The Gaia-ESO Survey: the Galactic Thick to Thin Disc transition
• Revised metallicity classes for low-mass stars: dwarfs (dM), subdwarfs (sdM), extreme subdwarfs (esdM), and ultra subdwarfs (usdM)
• Formation and Evolution of the Disk System of the Milky Way: [alpha/Fe] Ratios and Kinematics of the SEGUE G-Dwarf Sample
• Using chemical tagging to redefine the interface of the Galactic disk and halo
• Order and chaos in the local disc stellar kinematics induced by the Galactic bar
• Formation of the Widest Binaries from Dynamical Unfolding of Triple Systems
• Prospecting in late-type dwarfs: a calibration of infrared and visible spectroscopic metallicities of late-K and M dwarfs spanning 1.5 dex
• The formation of very wide binaries during the star cluster dissolution phase
• The stellar velocity distribution in the solar neighbourhood
• Kinematics and chemical properties of the Galactic stellar populations. The HARPS FGK dwarfs sample
• The SEGUE Stellar Parameter Pipeline. V. Estimation of Alpha-Element Abundance Ratios From Low-Resolution SDSS/SEGUE Stellar Spectra
• Constructing A Flexible Likelihood Function For Spectroscopic Inference
• A revision of the solar neighbourhood metallicity distribution
• The CARMENES search for exoplanets around M dwarfs - Photospheric parameters of target stars from high-resolution spectroscopy
• Identical or fraternal twins? : The chemical homogeneity of wide binaries from Gaia DR2
• The formation of permanent soft binaries in dispersing clusters
• 3D NLTE analysis of the most iron-deficient star, SMSS0313-6708
• The Earliest Phases of Galaxy Evolution
• Nearby stars from the LSPM-north Proper Motion Catalog. I. Main Sequence Dwarfs and Giants Within 33 Parsecs of the Sun
• Low-mass Binaries in the Hyades - A scarcity of brown dwarfs
• Characterizing Undetected Stellar Companions with Combined Datasets
• Formation of wide binary stars from adjacent cores
• The GALAH Survey: Verifying abundance trends in the open cluster M67 using non-LTE spectroscopy
• A high resolution spectroscopic atlas of M subdwarfs - Effective temperature and metallicity
• Radii of 88 M Subdwarfs and Updated Radius Relations for Low-Metallicity M Dwarf Stars
• A physically motivated and empirically calibrated method to measure effective temperature, metallicity, and Ti abundance of M dwarfs
• Fundamental M-dwarf parameters from high-resolution spectra using PHOENIX ACES models: I. Parameter accuracy and benchmark stars
• Chemical and Kinematic Properties of the Galactic Disk from the LAMOST and Gaia Sample Stars
• Formation of Wide Binaries by Turbulent Fragmentation
• The Delay Times of Type Ia Supernova
• Chemical Properties of the Local Galactic Disk and Halo. I. Fundamental Properties of 1,544 Nearby, High Proper-Motion M dwarfs and subdwarfs
• The metallicity distribution of F/G dwarfs derived from BATC survey data
• Characterisation of 92 Southern TESS Candidate Planet Hosts and a New Photometric [Fe/H] Relation for Cool Dwarfs
• Non-LTE radiative transfer in cool stars. Theory and applications to the abundance analysis for 24 chemical elements
• Isotopic Titanium Abundances in Local M Dwarfs
• The GALAH survey: Co-orbiting stars and chemical tagging
• Optical - Near Infrared Photometric Calibration of M-dwarf Metallicity and Its Application
• The M dwarf problem: Fe and Ti abundances in a volume-limited sample of M dwarf stars
• Asymmetric Mean Metallicity Distribution of the Milky Way's Disk
• M Subdwarf Research. II. Atmospheric Parameters and Kinematics
• The timescales of chemical enrichment in the Galaxy

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• The SPHINX M-dwarf Spectral Grid. I. Benchmarking New Model Atmospheres to Derive Fundamental M-Dwarf Properties
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• Near-infrared spectroscopic characterisation of Gaia ultra-cool dwarf candidates; Spectral types and peculiarities
• TOI-1743 b, TOI-5799 b, TOI-5799 c and TOI-6223 b: TESS discovery and validation of four super-Earth to Neptune-sized planets around M dwarfs
• M Subdwarf Research III. Spectroscopic Diagnostics for Breaking Parameter Degeneracy