Chemical analysis of eight giant stars of the globular cluster NGC 6366

Abstract

The metal-rich Galactic globular cluster NGC 6366 is the fifth closest to the Sun. Despite its interest, it has received scarce attention, and little is known about its internal structure. Its kinematics suggests a link to the halo, but its metallicity indicates otherwise. We present a detailed chemical analysis of eight giant stars of NGC 6366, using high resolution and high quality spectra (R > 40000, S/N > 60) obtained at the VLT (8.2 m) and CFHT (3.6 m) telescopes. We attempted to characterize its chemistry and to search for evidence of multiple stellar populations. The atmospheric parameters were derived using the method of excitation and ionization equilibrium of FeI and FeII lines and from those atmospheric parameters we calculated the abundances for other elements and found that none of the elements measured presents star-to-star variation greater than the uncertainties. We compared the derived abundances with those of other globular clusters and field stars available in the literature. We determined a mean [Fe/H] = -0.60 +- 0.03 for NGC 6366 and found some similarity of this object with M 71, another inner halo globular cluster. The Na-O anticorrelation extension is short and no star-to-star variation in Al is found. The presence of second generation stars is not evident in NGC 6366.

17 pages, 14 figures. Accepted for publication in MNRAS; Corrected typos and added references

References in corpus (32)

• Galactic chemical evolution: Carbon through Zinc
• Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• 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 ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IX. The Atlas of Multiple Stellar Populations
• Galactic Chemical Evolution and solar s-process abundances: dependence on the 13C-pocket structure
• Exploring Anticorrelations and Light Element Variations in Northern Globular Clusters Observed by the APOGEE Survey
• Light, Alpha, and Fe-Peak Element Abundances in the Galactic Bulge
• Globular Cluster Abundances from High-Resolution Integrated Light Spectra, I: 47 Tuc
• Na-O Anticorrelation and HB. VI. The chemical composition of the peculiar bulge globular cluster NGC 6388
• The chemical evolution of Manganese in different stellar systems
• Manganese Abundances in Cluster and Field Stars
• High-resolution abundance analysis of red giants in the globular cluster NGC 6522
• Na-O Anticorrelation And HB. III. The abundances of NGC 6441 from FLAMES-UVES spectra
• Barium even-to-odd isotope abundance ratios in thick disk and thin disk stars
• Heavy elements and chemical enrichment in globular clusters
• Galactic Chemical Evolution: the Impact of the 13C-pocket Structure on the s-process Distribution
• The Chemical Composition of the Galactic Bulge and Implications for its Evolution
• Radial distributions of sub-populations in the globular cluster M15: a more centrally concentrated primordial population
• The chemical composition of red giants in 47 Tucanae I: Fundamental parameters and chemical abundance patterns
• The chemical composition of the low-mass Galactic globular cluster NGC 6362
• Multiple stellar populations and their evolution in globular clusters: A nucleosynthesis perspective
• VLT-UVES abundance analysis of four giants in NGC 6553
• The Na-O anticorrelation in horizontal branch stars. V. NGC 6723
• Heavy Element Abundances in Giant Stars of 47 Tuc
• Chandra X-Ray Observatory Observations of the Globular Cluster M71
• Stellar abundances and ages for metal-rich Milky Way globular clusters - Stellar parameters and elemental abundances for 9 HB stars in NGC6352
• Light-Element Abundances of Giant Stars in the Globular Cluster M71 (NGC 6838)
• The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366
• Chemical Abundances of the Highly Obscured Galactic Globular Clusters 2MASS GC02 and Mercer 5

Cited by in corpus (9)

• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVI. The helium abundance of multiple populations
• Homogeneous metallicities and radial velocities for Galactic globular clusters. II. New CaT metallicities for 28 distant and reddened globular clusters
• Chemical abundances in the metal-intermediate GC NGC 6723
• Excess of Ca (and Sc) produced in globular cluster multiple populations: a first census in 77 Galactic globular clusters
• Relative Ages of Nine Inner Milky Way Globular Clusters from Proper Motion Cleaned Color-Magnitude Diagrams
• The in situ origin of the globular cluster NGC 6388 from abundances of Sc, V, and Zn of a large sample of stars
• Globular Clusters Lost by the Sagittarius Dwarf Spheroidal Galaxy
• Homogenous abundances of Mg, Si, Ca, and Ti for about 1500 red giants in 16 globular clusters from FLAMES spectra
• Homogeneous abundance ratios of hydrostatic and explosive alpha-elements in globular clusters from high resolution optical spectroscopy