Dynamically Tagged Groups of Metal-Poor Stars II. The Radial Velocity Experiment Data Release 6

Abstract

Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for $\sim 8,000$ metal-poor stars ([Fe/H] $\le -0.8$) compiled from the RAdial Velocity Experiment (RAVE) Data Release 6. Selected as metal-poor candidates based on broadband photometry, RAVE collected moderate-resolution ($R\sim 7,500$) spectra in the region of the Ca triplet for these stars. About $20\%$ of the stars in this sample also have medium-resolution ($1,200\lesssim R\lesssim 2,000$) validation spectra obtained over a four-year campaign from $2014$ to $2017$ with a variety of telescopes. We match the candidate stars to photometric metallicity determinations from the Huang et al. recalibration of the Sky Mapper Southern Survey Data Release 2. We obtain dynamical clusters of these stars from the orbital energy and cylindrical actions using the \HDBSCAN ~unsupervised learning algorithm. We identify $179$ Dynamically Tagged Groups (DTGs) with between $5$ and $35$ members; $67$ DTGs have at least $10$ member stars. Milky Way (MW) substructures such as Gaia-Sausage-Enceladus, the Metal-Weak Thick Disk, the Splashed Disk, Thamnos, the Helmi Stream, and LMS-1 (Wukong) are identified. Associations with MW globular clusters are determined for $10$ DTGs; no recognized MW dwarf galaxies were associated with any of our DTGs. Previously identified dynamical groups are also associated with our DTGs, with emphasis placed on their structural determination and possible new identifications. We identify chemically peculiar stars as members of several DTGs; we find $22$ DTGs that are associated with \textit{r}-process-enhanced stars. Carbon-enhanced metal-poor (CEMP) stars are identified among the targets with available spectroscopy, and we assign these to morphological groups following the approach given by Yoon et al.

References in corpus (49)

• The Gaia mission
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The mass distribution and gravitational potential of the Milky Way
• The Radial Velocity Experiment (RAVE): first data release
• Gaia Early Data Release 3: Photometric content and validation
• Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
• Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
• Gaia EDR3 view on Galactic globular clusters
• Streams, substructures and the early history of the Milky Way
• Evidence from the H3 Survey that the Stellar Halo is Entirely Comprised of Substructure
• Carbon-Enhanced Metal-Poor Star Frequencies in the Galaxy: Corrections for the Effect of Evolutionary Status on Carbon Abundances
• The Radial Velocity Experiment (RAVE): second data release
• SkyMapper Southern Survey: Second Data Release (DR2)
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
• Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars
• The stellar content of the Hamburg/ESO survey. IV. Selection of candidate metal-poor stars
• Complete element abundances of nine stars in the r-process galaxy Reticulum II
• The Sixth Data Release of the Radial Velocity Experiment (RAVE) -- II: Stellar Atmospheric Parameters, Chemical Abundances and Distances
• The Sixth Data Release of the Radial Velocity Experiment (RAVE) -- I: Survey Description, Spectra and Radial Velocities
• Disentangling the Galactic Halo with APOGEE: I. Chemical and Kinematical Investigation of Distinct Metal-Poor Populations
• The Proper Motion of Sagittarius A*: III. The Case for a Supermassive Black Hole
• A box full of chocolates: The rich structure of the nearby stellar halo revealed by Gaia and RAVE
• Halo Substructure in the SDSS-Gaia Catalogue : Streams and Clumps
• The Best and Brightest Metal-Poor Stars
• A Low-Mass Stellar-Debris Stream Associated with a Globular Cluster Pair in the Halo
• Disassembling the Galaxy with angle-action coordinates
• Population Studies. XIII. A New Analysis of the Bidelman-MacConnell "Weak-Metal" Stars - Confirmation of Metal-Poor Stars in the Thick Disk of the Galaxy
• Is the sky falling? Searching for stellar streams in the local Milky Way disc in the CORAVEL and RAVE surveys
• Kinematics of the local disk from the RAVE survey and the Gaia first data release
• Bright Metal-Poor Stars from the Hamburg/ESO Survey. II. A Chemodynamical Analysis
• Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys
• The Parallax Zero-Point of Gaia Early Data Release 3 from LAMOST Primary Red Clump Stars
• Beyond spectroscopy. I. Metallicities, distances, and age estimates for over twenty million stars from SMSS DR2 and Gaia EDR3
• The R-Process Alliance: Chemo-Dynamically Tagged Groups of Halo $r$-Process-Enhanced Stars Reveal a Shared Chemical-Evolution History
• Exploring the Galaxy's halo and very metal-weak thick disk with SkyMapper and Gaia DR2
• Milky Way Tomography with the SkyMapper Southern Survey. II. Photometric Re-calibration of SMSS DR2
• Dynamically Tagged Groups of Metal-Poor Stars from the Best \& Brightest Survey
• The chemodynamics of prograde and retrograde Milky Way stars
• Abundance Patterns of $\alpha$ and Neutron-capture Elements in the Helmi Stream
• Targeting Bright Metal-poor Stars in the Disk and Halo Systems of the Galaxy
• The substructures in the local stellar halo from Gaia and LAMOST
• Metal-Poor Stars Observed with the Southern African Large Telescope
• The Age-Metallicity-Specific Orbital Energy Relation for the Milky Way's Globular Cluster System Confirms the Importance of Accretion for Its Formation
• Metal-Poor Stars Observed with the Southern African Large Telescope II. An Extended Sample
• Two Populations of Carbon-Enhanced Metal-Poor Stars in the Disk System of the Milky Way
• Two substructures in the nearby stellar halo found in Gaia and RAVE

Cited by in corpus (11)

• Origin of highly $r$-process-enhanced stars in a cosmological zoom-in simulation of a Milky Way-like galaxy
• Chemo-Dynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-$s$ and CEMP-no Stars
• The R-Process Alliance: Chemo-Dynamically Tagged Groups II. An Extended Sample of Halo $r$-Process-Enhanced Stars
• Chronology of the chemical enrichment of the old Galactic stellar populations
• Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. III. Dynamically Tagged Groups and Chemodynamical Properties
• Candidate Members of the VMP/EMP Disk System of the Galaxy from the SkyMapper and SAGES Surveys
• Exploring the chemodynamics of metal-poor stellar populations
• Chemodynamical Properties and Ages of Metal-Poor Stars in S-PLUS
• A chemodynamical analysis of bright metal-poor stars from the HESP-GOMPA survey -- Indications of a non-prevailing site for light r-process elements
• Discovery of a pair of very metal-poor stars enriched in neutron-capture elements: The proto-disk r-II star BPS CS 29529-0089 and the Gaia-Sausage-Enceladus r-I star TYC 9219-2422-1
• Nearby stellar substructures in the Galactic halo from DESI Milky Way Survey Year 1 Data Release