APOGEE view of the globular cluster NGC 6544

Abstract

The second phase of the APOGEE survey is providing near-infrared, high-resolution, high signal-to-noise spectra of stars in the halo, disk, bar and bulge of the Milky Way. The near-infrared spectral window is especially important in the study of the Galactic bulge, where stars are obscured by the dust and gas of the disk in its line-of-sight. We present a chemical characterisation of the globular cluster NGC 6544 with high-resolution spectroscopy. The characterisation of the cluster chemical fingerprint, given its status of "interloper" towards the Galactic bulge and clear signatures of tidal disruption in its core is crucial for future chemical tagging efforts. Cluster members were selected from the DR16 of the APOGEE survey, using chemo-dynamical criteria of individual stars. A sample of 23 members of the cluster was selected. An analysis considering the intra-cluster abundance variations, known anticorrelations is given. According to the RGB content of the cluster, the iron content and $\alpha$-enhancement are [Fe/H] $=-1.44\pm 0.04$ dex and [$\alpha$/Fe] $=0.20\pm 0.04$ dex, respectively. Cluster members show a significant spread in [Fe/H] and [Al/Fe] that is larger than expected based on measurement errors. An [Al/Fe] spread, signal of an Mg-Al anticorrelation is observed and used to constraint the cluster mass budget, along with C, N, Mg, Si, K, Ca, and Ce element variations are discussed. Across all the analysed evolutionary stages (RGB and AGB), about $\sim 2/3$ (14 out of 23) show distinct chemical patterns, possibly associated with second-generation stars.

arXiv comment16 pages, 9 figures, MNRAS accepted

References in corpus (98)

• Scikit-learn: Machine Learning 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
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Swift Ultra-Violet/Optical Telescope
• Gaia Data Release 2: The astrometric solution
• 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
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• The Pan-STARRS1 Photometric System
• VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
• Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
• Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters
• Na-O Anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra
• ASPCAP: The Apogee Stellar Parameter and Chemical Abundances Pipeline
• Resolved Massive Star Clusters in the Milky Way and its Satellites: Brightness Profiles and a Catalogue of Fundamental Parameters
• The Pan-STARRS1 Surveys
• Intrinsic iron spread and a new metallicity scale for Globular Clusters
• Multiple Stellar Populations in Globular Clusters
• Improving PARSEC models for very low mass stars
• PARSEC evolutionary tracks of massive stars up to $350M_{\odot }$ at metallicities 0.0001$\le Z\le$0.04
• The Pan-STARRS1 Database and Data Products
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• A catalogue of masses, structural parameters and velocity dispersion profiles of 112 Milky Way globular clusters
• New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
• Gaia EDR3 view on Galactic globular clusters
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Mean proper motions, space orbits and velocity dispersion profiles of Galactic globular clusters derived from Gaia DR2 data
• The Data Reduction Pipeline for the Apache Point Observatory Galactic Evolution Experiment
• Origin of the system of globular clusters in the Milky Way
• Variable Stars in Galactic Globular Clusters
• VVV DR1: The First Data Release of the Milky Way Bulge and Southern Plane from the Near-Infrared ESO Public Survey VISTA Variables in the Via Lactea
• Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Stellar Iron Abundances: non-LTE Effects
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. V. Constraints on Formation Scenarios
• 4MOST: Project overview and information for the First Call for Proposals
• Galactic Chemical Evolution and solar s-process abundances: dependence on the 13C-pocket structure
• Target Selection for the SDSS-IV APOGEE-2 Survey
• Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2
• The RR Lyrae Period-Luminosity Relation. I. Theoretical Calibration
• The s-Process in Low Metallicity Stars. II. Interpretation of High-Resolution Spectroscopic Observations with AGB models
• Constraining the thermally-pulsing asymptotic giant branch phase with resolved stellar populations in the Small Magellanic Cloud
• New Analyses of Star-to-Star Abundance Variations Among Bright Giants in the Mildly Metal-Poor Globular Cluster M5
• Origin of multiple stellar populations in globular clusters and their helium enrichment
• Near-IR properties of 24 Globular Clusters in the Galactic Bulge
• Deciphering the 3D structure of the old Galactic bulge from the OGLE RR Lyrae stars
• The SDSS-III APOGEE Spectral Line List for H-band Spectroscopy
• 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
• Light nuclei in galactic globular clusters : constraints on the self-enrichment scenario from nucleosynthesis
• Exploring Anticorrelations and Light Element Variations in Northern Globular Clusters Observed by the APOGEE Survey
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. II. Kinematic profiles and maps
• Measuring Distances and Reddenings for a Billion Stars: Towards A 3D Dust Map from Pan-STARRS 1
• The Chemical Compositions of Accreted and {\it in situ} Galactic Globular Clusters According to SDSS/APOGEE
• Globular clusters in the Galactic bulge
• APOGEE Chemical Abundances of Globular Cluster Giants in the Inner Galaxy
• A homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code. I. The Northern clusters
• Near Infrared properties of 12 Globular Clusters toward the inner Bulge of the Galaxy
• Atypical Mg-poor Milky Way field stars with globular cluster second-generation like chemical patterns
• New near-infrared period-luminosity-metallicity relations for RR Lyrae stars and the outlook for Gaia
• Near-Infrared Photometry of Globular Clusters Towards the Galactic Bulge: Observations and Photometric Metallicity Indicators
• APOGEE DR14/DR15 Abundances in the Inner Milky Way
• A chemical trompe-l'œil: no iron spread in the globular cluster M22
• Super AGB and AGB evolution and the chemical inventory in NGC 2419
• Discovery of a Metal-Poor Field Giant with a Globular Cluster Second-Generation Abundance Pattern
• The Relationship Between Globular Cluster Mass, Metallicity, and Light Element Abundance Variations
• Homogeneous Metallicities and Radial Velocities for Galactic Globular Clusters
• The origin of the spurious iron spread in the globular cluster NGC 3201
• Globular clusters in the inner Galaxy classified from dynamical orbital criteria
• Mapping the stellar age of the Milky Way bulge with the VVV. III. High resolution reddening map
• Potassium in globular cluster stars: comparing normal clusters to the peculiar cluster NGC 2419
• Mapping the stellar age of the Milky Way bulge with the VVV. I. The method
• On Potassium and Other Abundance Anomalies of Red Giants in NGC 2419
• Proper motions in the VVV Survey: Results for more than 15 million stars across NGC 6544
• The VVV Survey RR Lyrae Population in the Galactic Centre Region
• Clear evidence for the presence of second-generation asymptotic giant branch stars in metal-poor Galactic globular clusters
• Search for Extra-Tidal RR Lyrae Stars in Milky Way Globular Clusters From Gaia DR2
• On the optimal calibration of VVV photometry
• Chemical analysis of Asymptotic Giant Branch stars in M62
• Self-consistent analysis of stellar clusters: An application to HST data of the halo globular cluster NGC 6752
• The Potassium abundance in the globular clusters NGC104, NGC6752 and NGC6809
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of single and multiple stellar populations in seven bulge globular clusters
• An Updated Census of RR~Lyrae Stars in the Globular Cluster $\omega$~Centauri (NGC\,5139)
• Deep Hubble Space Telescope Imaging of Globular Clusters Towards the Galactic Bulge: Observations, Data Reduction and Color-Magnitude Diagrams
• Carbon and nitrogen abundances of stellar populations in the globular cluster M 2
• The Tale of the Milky Way Globular Cluster NGC 6362 -- I. The Orbit and its possible extended star debris features as revealed by Gaia DR2
• Over 78 000 RR Lyrae Stars in the Galactic Bulge and Disk from the OGLE Survey
• The Orbit of the new Milky Way Globular Cluster FSR1716 = VVV-GC05
• Globular Cluster Intrinsic Iron Abundance Spreads: I. Catalog

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