On the Chemical and Kinematic Consistency Between N-rich Metal-poor Field Stars and Enriched Populations in Globular Clusters

Abstract

Interesting chemically peculiar field stars may reflect their stellar evolution history and their possible origin in a different environment from where they are found now, which is one of the most important research fields in Galactic archaeology. To explore this further, we have used the CN-CH bands around 4000 A to identify N-rich metal-poor field stars in LAMOST DR3. Here we expand our N-rich metal-poor field star sample to ~100 stars in LAMOST DR5, where 53 of them are newly found in this work. We investigate light elements of the common stars between our sample and APOGEE DR14. While Mg, Al, and Si abundances generally agree with the hypothesis that N-rich metal-poor field stars come from enriched populations in globular clusters, it is still inconclusive for C, N, and O. After integrating the orbits of our N-rich field stars and a control sample of normal metal-poor field stars, we find that N-rich field stars have different orbital parameter distributions compared to the control sample, specifically, apocentric distances, maximum vertical amplitude (Zmax), orbital energy, and z direction angular momentum (Lz). The orbital parameters of N-rich field stars indicate that most of them are inner-halo stars. The kinematics of N-rich field stars support their possible GC origin. The spatial and velocity distributions of our bona fide N-rich field star sample are important observational evidence to constrain simulations of the origin of these interesting objects.

Accepted by ApJ. Tables 2 and 3 are now available upon request, and will be uploaded online

References in corpus (27)

• Formation and Dynamical Evolution of Multiple Stellar Generations in Globular Clusters
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
• A new implementation of the infrared flux method using the 2MASS catalogue
• Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
• Thermohaline mixing: A physical mechanism governing the photospheric composition of low-mass giants
• Origin of the abundance patterns in Galactic globular clusters: constraints on dynamical and chemical properties of globular clusters
• The Streams of the Gaping Abyss: A population of entangled stellar streams surrounding the Inner Galaxy
• Constraining the thick disc formation scenario of the Milky Way
• Exploring Anticorrelations and Light Element Variations in Northern Globular Clusters Observed by the APOGEE Survey
• Disentangling the Galactic Halo with APOGEE: I. Chemical and Kinematical Investigation of Distinct Metal-Poor Populations
• A homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code. I. The Northern clusters
• CNO abundances in the globular clusters NGC 1851 and NGC 6752
• Atypical Mg-poor Milky Way field stars with globular cluster second-generation like chemical patterns
• Tracing the Hercules stream with Gaia and LAMOST: new evidence for a fast bar in the Milky Way
• Lithium-rich Giants in LAMOST Survey. I. The Catalog
• The Gaia-ESO Survey: A globular cluster escapee in the Galactic halo
• Chemodynamics of newly identified giants with globular cluster like abundance patterns in the bulge, disk, and halo of the Milky Way
• Two Groups of Red Giants with Distinct Chemical Abundances in the Bulge Globular Cluster NGC 6553 Through the Eyes of APOGEE
• Purveyors of fine halos: Re-assessing globular cluster contributions to the Milky Way halo build-up with SDSS-IV
• Staying away from the bar: the local dynamical signature of slow and fast bars in the Milky Way
• Six New Galactic Orbits of Globular Clusters in a Milky-Way-Like Galaxy
• Estimation of distances to stars with stellar parameters from LAMOST
• Chemical Study of the Metal-rich Globular Cluster NGC 5927
• Formation of N-rich field stars in the high-density building blocks of the Galactic bulge
• Gaia DR2 orbital properties for field stars with globular cluster-like CN band strengths

Cited by in corpus (12)

• Overview of the LAMOST survey in the first decade
• Nitrogen enrichment and clustered star formation at the dawn of the Galaxy
• The contribution of N-rich stars to the Galactic stellar halo using APOGEE red giants
• The mass-loss rates of star clusters with stellar-mass black holes: implications for the globular cluster mass function
• Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO) I. An updated census of APOGEE N-rich giants across the Milky Way
• Discovery of a large population of Nitrogen-Enhanced stars in the Magellanic Clouds
• An enquiry on the origins of N-rich stars in the inner Galaxy basedon APOGEE chemical compositions
• Near-infrared chemical abundances of stars in the Sculptor dwarf galaxy
• Multiple populations in low mass globular clusters: Palomar 13
• Chemical Tagging N-rich Field Stars with High-resolution Spectroscopy
• Detailed analysis of a sample of field metal-poor N-rich dwarfs
• APOGEE chemical abundances of stars in the MW satellites Fornax, Sextans, Draco and Carina