Open Cluster Chemical Homogeneity Throughout the Milky Way

Abstract

The chemical homogeneity of surviving stellar clusters contains important clues about interstellar medium (ISM) mixing efficiency, star formation, and the enrichment history of the Galaxy. Existing measurements in a handful of open clusters suggest homogeneity in several elements at the 0.03 dex level. Here we present (i) a new cluster member catalog based only on APOGEE radial velocities and Gaia-DR2 proper motions, (ii) improved abundance uncertainties for APOGEE cluster members, and (iii) the dependence of cluster homogeneity on Galactic and cluster properties, using abundances of eight elements from the APOGEE survey for ten high-quality clusters. We find that cluster homogeneity is uncorrelated with Galactocentric distance, |Z|, age, and metallicity. However, velocity dispersion, which is a proxy for cluster mass, is positively correlated with intrinsic scatter at relatively high levels of significance for [Ca/Fe] and [Mg/Fe]. We also see a possible positive correlation at a low level of significance for [Ni/Fe], [Si/Fe], [Al/Fe], and [Fe/H], while [Cr/Fe] and [Mn/Fe] are uncorrelated. The elements that show a correlation with velocity dispersion are those that are predominantly produced by core-collapse supernovae (CCSNe). However, the small sample size and relatively low correlation significance highlight the need for follow-up studies. If borne out by future studies, these findings would suggest a quantitative difference between the correlation lengths of elements produced predominantly by Type~Ia SNe versus CCSNe, which would have implications for Galactic chemical evolution models and the feasibility of chemical tagging.

arXiv commentAccepted for publication in ApJ; 21 pages (plus appendix), 21 figures, 4 tables

References in corpus (76)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations
• The New Galaxy: Signatures of its Formation
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• astroquery: An Astronomical Web-Querying Package in Python
• ASPCAP: The Apogee Stellar Parameter and Chemical Abundances Pipeline
• Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• Star Clusters Across Cosmic Time
• Astrophysical parameters of Galactic open clusters
• Properties of stellar generations in Globular Clusters and relations with global parameters
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• The Data Reduction Pipeline for the Apache Point Observatory Galactic Evolution Experiment
• A Spectroscopic Study of the Ancient Milky Way: F- and G-Type Stars in the Third Data Release of the Sloan Digital Sky Survey
• First GLIMPSE Results on the Stellar Structure of the Galaxy
• Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• Target Selection for the SDSS-IV APOGEE-2 Survey
• APOGEE Data Releases 13 and 14: Data and Analysis
• The Close Binary Fraction of Solar-type Stars is Strongly Anti-correlated with Metallicity
• SOAR TESS Survey. I: Sculpting of TESS planetary systems by stellar companions
• StarHorse: A Bayesian tool for determining stellar masses, ages, distances, and extinctions for field stars
• Untangling the Galaxy I: Local Structure and Star Formation History of the Milky Way
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVI. The helium abundance of multiple populations
• A systematic survey for infrared star clusters with |b|<20deg using 2MASS
• Lifting the Dusty Veil With Near- and Mid-Infrared Photometry: I. Description and Applications of the Rayleigh-Jeans Color Excess Method
• The Long-term Evolution of the Galactic Disk Traced by Dissolving Star Clusters
• From the bulge to the outer disc: StarHorse stellar parameters, distances, and extinctions for stars in APOGEE DR16 and other spectroscopic surveys
• Simultaneous calibration of spectro-photometric distances and the Gaia DR2 parallax zero-point offset with deep learning
• The Open Cluster Chemical Abundances and Mapping Survey: IV. Abundances for 128 Open Clusters using SDSS/APOGEE DR16
• Homogeneous Analysis of Globular Clusters from the APOGEE Survey with the BACCHUS Code. II. The Southern Clusters and Overview
• APOGEE Data Releases 13 and 14: Stellar Parameter and Abundance Comparisons With Independent Analyses
• Calibrations of Atmospheric Parameters Obtained from the First Year of SDSS-III APOGEE Observations
• Chemical Cartography with APOGEE: Multi-element abundance ratios
• The chemical homogeneity of open clusters
• Stellar Multiplicity Meets Stellar Evolution And Metallicity: The APOGEE View
• Chemical Homogeneity in Collinder 261 and Implications for Chemical Tagging
• Chemical Homogeneity in the Hyades
• The Gaia-ESO Survey: Exploring the complex nature and origins of the Galactic bulge populations
• A Chemical Abundance Study of 10 Open Clusters Based on WIYN-Hydra Spectroscopy
• Close Binary Companions to APOGEE DR16 Stars: 20,000 Binary-star Systems Across the Color-Magnitude Diagram
• An accurate and self-consistent chemical abundance catalogue for the APOGEE/Kepler sample
• The Hyades open cluster is chemically inhomogeneous
• Open Clusters as Galactic Disk Tracers: I. Project Motivation, Cluster Membership and Bulk Three-Dimensional Kinematics
• Galactic Doppelganger: The chemical similarity among field stars and among stars with a common birth origin
• WIYN Open Cluster Study. XXIV. Stellar Radial-Velocity Measurements in NGC 6819
• Chemical Abundances of Main-Sequence, Turnoff, Subgiant and red giant Stars from APOGEE spectra II: Atomic Diffusion in M67 Stars
• The chemical compositions of solar twins in the open cluster M67
• Metallicity Fluctuation Statistics in the Interstellar Medium and Young Stars. I. Variance and Correlation
• Sodium and Oxygen Abundances in the Open Cluster NGC 6791 from APOGEE H-Band Spectroscopy
• Testing the chemical tagging technique with open clusters
• Radioactive Probes of the Supernova-Contaminated Solar Nebula: Evidence that the Sun was Born in a Cluster
• The Open Cluster Chemical Abundances and Mapping Survey: II. Precision Cluster Abundances for APOGEE using SDSS DR14
• NLTE Chemical abundances in Galactic open and globular clusters
• Spectroscopic Abundances in the Open Cluster, NGC 6819
• High resolution elemental abundance analysis of the Hyades Supercluster
• WIYN Open Cluster Study : Wide-Field CCD Photometry of the Old Open Cluster NGC 6819
• Mixing of metals during star cluster formation: statistics and implications for chemical tagging
• Cosmic variance in [O/Fe] in the Galactic disk
• Asteroseismic Study on Cluster Distance Moduli for RGB Stars in NGC 6791 and NGC 6819
• Chemical inhomogeneities in the Pleiades: signatures of rocky-forming material in stellar atmospheres
• Formation of young massive clusters from turbulent molecular clouds
• Machine learning in APOGEE: Identification of stellar populations through chemical abundances
• An Extragalactic Chromosome Map: The intermediate age SMC Cluster Lindsay 1
• Lithium Inventory of 2 $M_{\odot }$ Red Clump Stars in Open Clusters: A Test of the Helium Flash Mechanism

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• Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
• Mapping the Galactic Metallicity Gradient with Open Clusters: The State-of-the-Art and Future Challenges
• The Milky Way tomography with APOGEE: intrinsic density distribution and structure of mono-abundance populations
• The homogeneity of the star forming environment of the Milky Way disk over time
• A metallicity study of F, G, K and M dwarfs in the Coma Berenices open cluster from the APOGEE survey
• Statistics of the Chemical Composition of Solar Analog Stars and Links to Planet Formation
• The longevity of the oldest open clusters: Structural parameters of NGC 188, NGC 2420, NGC 2425, NGC 2682, NGC 6791, NGC 6819
• The Gaia-ESO Survey: Chemical tagging in the thin disk. Open clusters blindly recovered in the elemental abundance space
• Chemical Cartography with APOGEE: Two-process Parameters and Residual Abundances for 288,789 Stars from Data Release 17
• A GALAH View of the Chemical Homogeneity and Ages of Stellar Strings Identified in Gaia
• Inferring stellar parameters and their uncertainties from high-resolution spectroscopy using invertible neural networks
• Measuring Dwarf Galaxy Intrinsic Abundance Scatter with Mid-resolution Spectroscopic Surveys: Calibrating APOGEE Abundance Errors
• The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar and APOGEE-2 Data
• The GALAH survey: Improving chemical abundances using star clusters
• Orbital Parameters and Binary Properties of 37 FGK stars in the Cores of Open Clusters NGC 2516 and NGC 2422
• The dawn is quiet here: Rise in [$\alpha$/Fe] is a signature of massive gas accretion that fueled proto-Milky Way
• Functional Data Analysis for Extracting the Intrinsic Dimensionality of Spectra: Application to Chemical Homogeneity in the Open Cluster M67