The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366

Abstract

We present radial velocities and chemical abundances for red giant branch stars in the Galactic bulge globular clusters NGC 6342 and NGC 6366. The velocities and abundances are based on measurements of high resolution (R > 20,000) spectra obtained with the MMT-Hectochelle and WIYN-Hydra spectrographs. We find that NGC 6342 has a heliocentric radial velocity of +112.5 km/s (sigma = 8.6 km/s), NGC 6366 has a heliocentric radial velocity of -122.3 km/s (sigma = 1.5 km/s), and that both clusters have nearly identical metallicities ([Fe/H] ~ -0.55). NGC 6366 shows evidence of a moderately extended O-Na anti-correlation, but more data are needed for NGC 6342 to determine if this cluster also exhibits the typical O-Na relation likely found in all other Galactic globular clusters. The two clusters are distinguished from similar metallicity field stars as having larger [Na/Fe] spreads and enhanced [La/Fe] ratios, but we find that NGC 6342 and NGC 6366 display alpha and Fe-peak element abundance patterns that are typical of other metal-rich ([Fe/H] > -1) inner Galaxy clusters. However, the median [La/Fe] abundance may vary from cluster-to-cluster.

41 pages; 6 figures; 7 tables; AJ in press

References in corpus (72)

• The Dartmouth Stellar Evolution Database
• 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
• Na-O Anticorrelation and HB. VIII. Proton-capture elements and metallicities in 17 globular clusters from UVES spectra
• 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. I. Overview of the Project and Detection of Multiple Stellar Populations
• The ACS Survey of Galactic Globular Clusters. VII. Relative Ages
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. V. Evidence for a wide age distribution and a complex MDF
• The Ages of 55 Globular Clusters as Determined Using an Improved delta V_TO^HB Method Along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues
• The ACS Survey of Galactic Globular Clusters. IX. Horizontal Branch Morphology and the Second Parameter Phenomenon
• A new implementation of the infrared flux method using the 2MASS catalogue
• Chemical Abundances for 855 Giants in the Globular Cluster Omega Centauri (NGC 5139)
• The cluster Terzan 5 as a remnant of a primordial building block of the Galactic bulge
• Discovery of Extended Blue Horizontal Branches in Two Metal-Rich Globular Clusters
• The Bulge Radial Velocity Assay (BRAVA): II. Complete Sample and Data Release
• The metallicity distribution of bulge clump giants in Baade's Window
• Fundamental Parameters and Chemical Composition of Arcturus
• Chemical similarities between Galactic bulge and local thick disk red giants: O, Na, Mg, Al, Si, Ca and Ti
• Accreted versus In Situ Milky Way Globular Clusters
• ARGOS IV: The Kinematics of the Milky Way Bulge
• Chemical similarities between Galactic bulge and local thick disk red giant stars
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. IV. Two bulge populations
• Alpha element abundances and gradients in the Milky Way bulge from FLAMES-GIRAFFE spectra of 650 K giants
• Globular cluster system and Milky Way properties revisited
• Line lists for the A2PI-X2Sigma+ (red) and {B2Sigma+-X2Sigma} (violet) Systems of CN, 13C14N, and 12C15N, and Application to Astronomical Spectra
• Galactic Globular Cluster Metallicity Scale from the Ca II Triplet. I. Catalog
• Abundances in giant stars of the globular cluster NGC 6752
• Light nuclei in galactic globular clusters : constraints on the self-enrichment scenario from nucleosynthesis
• Iron and neutron-capture element abundance variations in the globular cluster M2 (NGC 7089)
• The GIRAFFE Inner Bulge Survey (GIBS). I. Survey Description and a kinematical map of the Milky Way bulge
• Kinematics of the Galactic Globular Cluster System: New Radial Velocities for Clusters in the Direction of the Inner Galaxy
• Light, Alpha, and Fe-Peak Element Abundances in the Galactic Bulge
• The Bizarre Chemical Inventory of NGC 2419, An Extreme Outer Halo Globular Cluster
• Abundance Analysis of Turn-Off and Early Subgiant Stars in the Globular Cluster 47 Tuc (NGC 104)
• Spectroscopy Unveils the Complex Nature of Terzan 5
• Uncloaking globular clusters in the inner Galaxy
• The Red Giant Branch in the Near-Infrared Colour-Magnitude Diagrams. I: The calibration of photometric indices
• Five groups of red giants with distinct chemical composition in the globular cluster NGC 2808
• Detailed Abundances for a Large Sample of Giant Stars in the Globular Cluster 47 Tucanae (NGC 104)
• An abundance analysis for four Red Horizontal Branch Stars in the extremely metal rich globular cluster NGC 6528
• Chemical abundances for 11 bulge stars from high-resolution, near-IR spectra
• An Abundance Analysis for Five Red Horizontal Branch Stars in the Extremely Metal Rich Globular Cluster NGC 6553
• Constraints on the Formation of the Galactic Bulge from Na, Al, and Heavy Element Abundances in Plaut's Field
• Alpha Enhancement and the Metallicity Distribution Function of Plaut's Window
• Na-O Anticorrelation and Horizontal Branches. V. The Na-O anticorrelation in NGC 6441 from Giraffe spectra
• Red Giant Branch Bump Brightness and Number Counts in 72 Galactic Globular Clusters Observed with the Hubble Space Telescope
• The Terzan 5 puzzle: discovery of a third, metal-poor component
• A Spectroscopic Analysis of the Galactic Globular Cluster NGC 6273 (M19)
• Na-O Anticorrelation and HB. VI. The chemical composition of the peculiar bulge globular cluster NGC 6388
• VLT-FLAMES Analysis of 8 giants in the Bulge Metal-poor Globular Cluster NGC 6522: Oldest Cluster in the Galaxy?
• Ba stars and other binaries in first and second generation stars in globular clusters
• Gemini-Phoenix infrared high-resolution abundance analysis of five giants in the bulge globular cluster NGC 6553
• The extreme chemistry of multiple stellar populations in the metal-poor globular cluster NGC 4833
• Metallicity Distribution Functions, Radial Velocities, and Alpha Element Abundances in Three Off-Axis Bulge Fields
• The intriguing stellar populations in the globular clusters NGC 6388 and NGC 6441
• Na-O Anticorrelation And HB. III. The abundances of NGC 6441 from FLAMES-UVES spectra
• Super AGB and AGB evolution and the chemical inventory in NGC 2419
• High resolution infrared spectra of NGC 6440 and NGC 6441: two massive Bulge Globular Clusters
• Proper motions and kinematics of selected bulge globular clusters
• High resolution infrared spectra of NGC 6342 and NGC 6528: two moderately reddened Bulge Globular Clusters
• High resolution near-IR spectra of NGC 6624 and NGC 6569
• A Fossil Bulge Globular Cluster revealed by VLT Multi-Conjugate Adaptive Optics
• VLT-UVES abundance analysis of four giants in NGC 6553
• Space Velocities of Southern Globular Clusters VI. Nine Clusters in the Inner Milky Way
• Near-Infrared photometry and spectroscopy of NGC 6539 and UKS 1: two intermediate metallicity Bulge Globular Clusters
• Detailed Abundances of 15 Stars in the Metal-Poor Globular Cluster NGC 4833
• Stellar abundances and ages for metal-rich Milky Way globular clusters - Stellar parameters and elemental abundances for 9 HB stars in NGC6352
• Double Horizontal Branches in NGC 6440 and NGC 6569 unveiled by the VVV Survey
• Light-Element Abundances of Giant Stars in the Globular Cluster M71 (NGC 6838)
• Chemical Abundances of Red Giant Stars in the Globular Cluster M107 (NGC 6171)
• Multichromatic colour-magnitude diagrams of the globular cluster NGC 6366
• Some Global Characteristics of the Galactic Globular Cluster System

Cited by in corpus (17)

• A catalogue of masses, structural parameters and velocity dispersion profiles of 112 Milky Way globular clusters
• What is a globular cluster? An observational perspective
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVI. The helium abundance of multiple populations
• NGC 6535: the lowest mass Milky Way globular cluster with a Na-O anti-correlation? Cluster mass and age in the multiple population context
• Chemical Complexity in the Eu-enhanced Monometallic Globular Cluster NGC 5986
• Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569
• The WAGGS project - II. The reliability of the calcium triplet as a metallicity indicator in integrated stellar light
• A census of new globular clusters in the Galactic bulge
• From globular clusters to the disc: the dual life of our Galaxy
• The chemical composition of NGC5824, a globular cluster without iron spread but with an extreme Mg-Al anticorrelation
• 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
• Chemical analysis of eight giant stars of the globular cluster NGC 6366
• Globular Clusters Lost by the Sagittarius Dwarf Spheroidal Galaxy
• On the maximum helium content of multiple populations in the globular cluster NGC6752
• CAPOS: The bulge Cluster APOgee Survey VIII. Final ASPCAP results for all clusters
• Globular Cluster Intrinsic Iron Abundance Spreads: I. Catalog