Fe and Al Abundances in the Globular Cluster NGC 6171

Details Fe and Al Abundances in the Globular Cluster NGC 6171 Fe and Al Abundances in the Globular Cluster NGC 6171

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344222o&link_type=abstract

American Astronomical Society, AAS Meeting #213, #442.22; Bulletin of the American Astronomical Society, Vol. 41, p.322

Astronomy and Astrophysics

Astronomy

Scientific paper

We have performed chemical analyses for eleven stars in the metal-rich
globular cluster NGC 6171 using spectra obtained with the WIYN 3.5m telescope and Hydra multifiber spectrograph. The observed wavelength range covers 6460-6860 A with an average S/N ratio 75. Effective temperatures, surface gravities, and microturbulent velocities were estimated using V-K photometry and bolometric magnitudes, but further refined using spectroscopic analyses based on equivalent width measurements. All abundances were determined using the LTE line analysis code MOOG and ATLAS9 model atmospheres. We find <[Fe/H]>= -1.17 ± 0.13, which is consistent with previous photometric and small sample spectroscopic estimates. Al appears enhanced with <[Al/Fe]>= +0.62 ± 0.09, but the modest star-to-star dispersion differs from the trend seen in more metal-poor globular clusters.

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