High resolution infrared spectroscopy of the old open cluster NGC6791

Details High resolution infrared spectroscopy of the old open cluster NGC6791 High resolution infrared spectroscopy of the old open cluster NGC6791

2006-04-03

arxiv.org/abs/astro-ph/0604030v1

Astrophys.J. 646 (2006) 499-504

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, accepted for publication on ApJ

Scientific paper

10.1086/504829

We report abundance analysis for 6 M giant members of the old open cluster NGC6791, based on infrared spectroscopy (1.5-1.8 micron) at R=25,000, using the NIRSPEC spectrograph at the Keck II telescope. We find the iron abundance <[Fe/H]>= +0.35 +/- 0.02$, confirming the super solar metallicity of this cluster derived from optical medium-high resolution spectroscopy. We also measure C, O and other alpha element abundances, finding roughly solar [alpha/Fe] and <[C/Fe]> = -0.35. Our approach constrains [O/Fe] especially well, based on the measurement of a number of OH lines near 1.6micron; we find [O/Fe]=-0.07 +/-0.03. The Solar alpha enhancement is in contrast to the composition of similar stars in the Galactic bulge. We also find low 12C/13C~10, confirming the presence of extra-mixing processes during the red giant phase of evolution, up to super solar metallicities.

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