2MASS J17203084-1920274 , the SIMBAD biblio

2016AJ....152...21J - Astron. J., 152, 21-21 (2016/July-0)

The chemical composition of red giant branch stars in the galactic globular clusters NGC 6342 and NGC 6366.


Abstract (from CDS):

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 (σ=8.6 km/s), NGC 6366 has a heliocentric radial velocity of -122.3 km/s (σ=1.5 km/s), and 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 α 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.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: general - globular clusters: individual: (NGC 6342, NGC 6366) - stars: abundances

VizieR on-line data: <Available at CDS (J/AJ/152/21): table1.dat table2.dat table3.dat table4.dat table5.dat>

Simbad objects: 337

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