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2011MNRAS.414.2690V - Mon. Not. R. Astron. Soc., 414, 2690-2695 (2011/July-1)
High-resolution near-infrared spectra of NGC 6624 and 6569.
VALENTI E., ORIGLIA L. and RICH R.M.
Abstract (from CDS):
We find [Fe/H]=-0.79 ±0.02 and -0.69±0.02 dex for NGC 6569 and 6624, respectively, and an average α-element enhancement of ≈+0.43±0.02 and +0.39 ± 0.02 dex, consistent with previous measurements on other metal-rich bulge clusters. We measure accurate radial velocities of <vr>=-47 ± 4 and +51±3 km/s and velocity dispersions of ≈8 and 6 km/s for NGC 6569 and 6624, respectively.
Finally, we find very low 12C/13C isotopic ratio ( ≤ 7 in NGC 6624 and ≈5 in NGC 6569), confirming the presence of extramixing mechanisms during the red giant branch evolution phase.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): techniques: spectroscopic - stars: abundances - stars: late-type - Galaxy: bulge - globular clusters: individual: NGC 6569 - globular clusters: individual: NGC 6624
Simbad objects: 27
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