Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5830j&link_type=abstract
American Astronomical Society, AAS Meeting #211, #58.30; Bulletin of the American Astronomical Society, Vol. 39, p.838
Astronomy and Astrophysics
Astronomy
Scientific paper
We have derived iron and aluminum abundances for nearly 200 red giant branch (RGB) stars using moderate resolution (R 15,000) spectra obtained with the Blanco 4M telescope and Hydra multifiber spectrograph. Temperatures and gravities are based on V-K photometric indices and microturbulence was determined by removing abundance trends as a function of reduced width. The observed wavelength region is 6500-6750 Å with typical signal-to-noise (S/N) ratios ranging from 75-150. Fe and Al abundances were derived using either spectrum synthesis or equivalent width measurements along with the LTE line analysis code MOOG and ATLAS 9 model atmospheres. Our [Fe/H] results are in agreement with previous studies that indicate the presence of multiple giant branches with a metallicity spread of -2.0<[Fe/H]<-0.50. [Al/Fe] data indicate a nearly 1.5 dex spread that is uniform across all metallicities and evolutionary states.
Support of the College of Arts and Sciences at Indiana University Bloomington for C.I.J. is gratefully acknowledged.
Johnson Christian I.
Pilachowski Catherine A.
Schwenk Dustin
Simmerer Jennifer
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