High resolution near-IR spectra of NGC 6624 and NGC 6569

E. Valenti; L. Origlia; R. M. Rich

doi:10.1111/j.1365-2966.2011.18580.x

paper

High resolution near-IR spectra of NGC 6624 and NGC 6569

arXiv:1103.0233 · doi:10.1111/j.1365-2966.2011.18580.x

Abstract

We present the first abundances analysis based on high-resolution infrared (IR) echelle spectra of NGC 6569 and NGC 6624, two moderately reddened globular clusters located in the outer bulge of the Galaxy. We find [Fe/H]=-0.79 $\pm$ 0.02 dex and [Fe/H]=-0.69 $\pm$ 0.02 dex for NGC 6569 and NGC 6624, respectively and an average $α$ -elements enhancement of $\approx$ +0.43 $\pm$ 0.02 dex and +0.39 $\pm$ 0.02 dex, consistent with previous measurements on other metal-rich Bulge clusters. We measure accurate radial velocities of $< v_{r} >= - 47 \pm 4km s^{- 1}$ and $< v_{r} >= + 51 \pm 3km s^{- 1}$ and velocity dispersions of $\approx 8km s^{- 1}$ and $\approx 6km s^{- 1}$ for NGC 6569 and NGC 6624, respectively. Finally, we find very low $^{12} C /^{13} C$ isotopics ratio ( $\leq$ 7 in NGC 6624 and $\approx$ 5 in NGC 6569), confirming the presence extra-mixing mechanisms during the red giant branch evolution phase.

7 pages, 3 figures, accepted for publication on MNRAS

High resolution near-IR spectra of NGC 6624 and NGC 6569

Abstract

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