NGC 6139: a normal massive globular cluster or a first-generation dominated cluster? Clues from the light elements
arXiv:1507.07562 · doi:10.1051/0004-6361/201526592
Abstract
Information on globular clusters (GC) formation mechanisms can be gathered by studying the chemical signature of the multiple populations that compose these stellar systems. In particular, we are investigating the anticorrelations among O, Na, Al, and Mg to explore the influence of cluster mass and environment on GCs in the Milky Way and in extragalactic systems. We present here the results obtained on NGC 6139 which, on the basis of its horizontal branch morphology, had been proposed to be dominated by first-generation stars. In our extensive study based on high resolution spectroscopy, the first for this cluster, we found a metallicity of [Fe/H]= -1.579 +/- 0.015 +/- 0.058 (rms=0.040 dex, 45 bona fide member stars) on the UVES scale defined by our group. The stars in NGC 6139 show a chemical pattern normal for GCs, with a rather extended Na-O (and Mg-Al) anticorrelation. NGC 6139 behaves like expected from its mass and contains a large fraction (about two thirds) of second-generation stars.
Accepted for publication on A&A
References in corpus (17)
- Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
- The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
- Spectroscopic and Photometric evidence of two stellar populations in the Galactic Globular Cluster NGC6121 (M4)
- DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
- The exotic chemical composition of the Sagittarius dwarf Spheroidal galaxy
- 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
- Looking outside the Galaxy: the discovery of chemical anomalies in 3 old Large Magellanic Cloud clusters
- VLT/UVES Spectroscopy of Individual Stars in Three Globular Clusters in the Fornax Dwarf Spheroidal Galaxy
- A General Abundance Problem for All Self-Enrichment Scenarios for the Origin of Multiple Populations in Globular Clusters
- Sodium and Oxygen Abundances in the Open Cluster NGC 6791 from APOGEE H-Band Spectroscopy
- Searching for Chemical Signatures of Multiple Stellar Populations in the Old, Massive Open Cluster NGC 6791
- O and Na abundance patterns in open clusters of the Galactic disk
- The link between chemical anomalies along the red giant branch and the horizontal branch extension in globular clusters
- Three discrete groups with homogeneous chemistry along the red giant branch in the globular cluster NGC 2808
- O, Na, Ba and Eu abundance patterns in open clusters
- The Old, Super-Metal-Rich Open Cluster, NGC 6791 - Elemental Abundances in Turn-off Stars from Keck/HIRES Spectra
Cited by in corpus (18)
- What is a globular cluster? An observational perspective
- N-body modeling of globular clusters: Masses, mass-to-light ratios and intermediate-mass black holes
- Paving the way for the JWST: witnessing globular cluster formation at z>3
- Gas expulsion in massive star clusters? Constraints from observations of young and gas-free objects
- New PARSEC database of alpha-enhanced stellar evolutionary tracks and isochrones I. Calibration with 47 Tuc (NGC104) and the improvement on RGB bump
- NGC 6535: the lowest mass Milky Way globular cluster with a Na-O anti-correlation? Cluster mass and age in the multiple population context
- The Relationship Between Globular Cluster Mass, Metallicity, and Light Element Abundance Variations
- Multiple stellar populations in the globular cluster M3 (NGC 5272): a Strömgren perspective
- Chemical characterization of the globular cluster NGC 5634 associated to the Sagittarius dwarf spheroidal galaxy
- Searching for GC-like abundance patterns in young massive clusters
- Explaining the multiple populations in globular clusters by multiple episodes of star formation and enrichment without gas expulsion from massive star feedback
- The WAGGS project - II. The reliability of the calcium triplet as a metallicity indicator in integrated stellar light
- Empirical estimates of the Na-O anti-correlation in 95 Galactic globular clusters
- Searching for GC-like abundance patterns in young massive clusters II. - Results from the Antennae galaxies
- Abundances in a sample of turnoff and subgiant stars in NGC 6121 (M4)
- A high-resolution spectroscopic study of two new Na- and Al-rich field giants -- likely globular cluster escapees in the Galactic halo
- Globular Cluster Intrinsic Iron Abundance Spreads: I. Catalog
- Synthetic spectroscopic indices for identifying multiple stellar populations in globular clusters